{"certification":{"candidate":{"basis":{"family":{"first_index":0,"initial_polynomials":[["1"],["1","1"]],"recurrence":{"terms":[{"coeff":{"coeffs":[["1","1"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["0","1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"name":"A008288"},"coefficient_family":{"first_index":1,"initial_polynomials":[["1"],["1","2"]],"recurrence":{"denominator":{"coeffs":[["1"],["-1"]]},"terms":[{"coeff":{"coeffs":[["3","6"],["-2","-4"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["-2"],["1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"}},"coefficient_roots":{"lower_bound":{"attempts":[{"detail":"the leader is not a nonzero constant","route":"periodic_product","success":false,"variant":"P_(n+k) = c(x) P_n"},{"detail":"no theorem matched (weighted_renewal_window: LHS must be a nonzero constant; fixed_delay_predecessor_window: LHS must be a nonzero constant)","route":"paper_theorem","success":false,"variant":"match_recurrence_theorems"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 3 row(s)"},{"detail":"P_n = (a_n x + b_n) P_(n-1) - c_n P_(n-2) for n >= 3, with a_n = (-4 n + 6)/(n - 1), b_n = (-2 n + 3)/(n - 1), c_n = (n - 2)/(n - 1): every P_n, n >= 1, is nonzero and real-rooted, with simple roots from n = 1 on; P_(n-1) strictly interlaces P_n for n >= 2; every root lies in (-inf, 0)","route":"three_term_recurrence","success":true,"variant":"three_term_recurrence"}],"conditional_on":[],"interlacing":{"from_index":2,"justification":{"premises":["every hypothesis of the theorem is verified exactly for every index: P_n = (a_n x + b_n) P_(n-1) - c_n P_(n-2) for n >= 3, with a_n = (-4 n + 6)/(n - 1), b_n = (-2 n + 3)/(n - 1), c_n = (n - 2)/(n - 1)","every P_n, n >= 1, is nonzero and real-rooted, with simple roots from n = 1 on; P_(n-1) strictly interlaces P_n for n >= 2; every root lies in (-inf, 0)"],"theorem":"three_term_recurrence: three-term recurrence Q_n = (a_n y + b_n) Q_(n-1) - c_n Q_(n-2) with a_n != 0 and beta_n = c_n / (a_n a_(n-1)) > 0: simple real roots and strict interlacing of consecutive rows (zero separation for orthogonal polynomials: G. Szeg\u0151, Orthogonal Polynomials, \u00a73.3; Favard, C. R. Acad. Sci. Paris 200 (1935)); root regions by a positive-ratio (chain-sequence) induction"},"kind":"strict","orientation":"previous_interlaces_next"},"route":"three_term_recurrence","rows_checked":10,"statement":"every parent row P_n, n >= 1, is zero or real-rooted with coefficients of one sign","status":"proved"},"parent_proof":{"route":"basis_map_coefficient_roots(three_term_recurrence, three_term_recurrence)","statement":"every coefficient row R_n, n >= 1, is zero or real-rooted with every root in [-1, 0]","status":"proved"},"source_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1296121037/536870912","radicand":"2","rational_part":"-1","sqrt_coefficient":"-1","text":"-1 - sqrt(2)","upper_bound":"-10368968295/4294967296"}},"upper":{"closed":true,"value":{"lower_bound":"0","radicand":"1","rational_part":"0","sqrt_coefficient":"0","text":"0","upper_bound":"0"}}},"target_interval":{"lower":{"closed":true,"value":"-1"},"upper":{"closed":true,"value":"0"}},"upper_bound":{"attempts":[{"detail":"the leader is not a nonzero constant","route":"periodic_product","success":false,"variant":"P_(n+k) = c(x) P_n"},{"detail":"no theorem matched (weighted_renewal_window: LHS must be a nonzero constant; fixed_delay_predecessor_window: LHS must be a nonzero constant)","route":"paper_theorem","success":false,"variant":"match_recurrence_theorems"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 1 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 2 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"identity (affine 1, 0), induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"f_polynomial, induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"reversal, induction start moved 3 row(s)"},{"detail":"no unconditional all-index source claim with roots in (-inf, 0]","route":"root_domain","success":false,"variant":"mobius (1, 0, -1, 1), induction start moved 3 row(s)"},{"detail":"P_n = (a_n x + b_n) P_(n-1) - c_n P_(n-2) for n >= 3, with a_n = (4 n - 6)/(n - 1), b_n = (2 n - 3)/(n - 1), c_n = (n - 2)/(n - 1): every P_n, n >= 1, is nonzero and real-rooted, with simple roots from n = 1 on; P_(n-1) strictly interlaces P_n for n >= 2; every root lies in (-inf, 0)","route":"three_term_recurrence","success":true,"variant":"three_term_recurrence"}],"conditional_on":[],"interlacing":{"from_index":2,"justification":{"premises":["every hypothesis of the theorem is verified exactly for every index: P_n = (a_n x + b_n) P_(n-1) - c_n P_(n-2) for n >= 3, with a_n = (4 n - 6)/(n - 1), b_n = (2 n - 3)/(n - 1), c_n = (n - 2)/(n - 1)","every P_n, n >= 1, is nonzero and real-rooted, with simple roots from n = 1 on; P_(n-1) strictly interlaces P_n for n >= 2; every root lies in (-inf, 0)"],"theorem":"three_term_recurrence: three-term recurrence Q_n = (a_n y + b_n) Q_(n-1) - c_n Q_(n-2) with a_n != 0 and beta_n = c_n / (a_n a_(n-1)) > 0: simple real roots and strict interlacing of consecutive rows (zero separation for orthogonal polynomials: G. Szeg\u0151, Orthogonal Polynomials, \u00a73.3; Favard, C. R. Acad. Sci. Paris 200 (1935)); root regions by a positive-ratio (chain-sequence) induction"},"kind":"strict","orientation":"previous_interlaces_next"},"route":"three_term_recurrence","rows_checked":10,"statement":"every parent row P_n, n >= 1, is zero or real-rooted with coefficients of one sign","status":"proved"}},"conclusion":{"hypotheses":["characteristic_parameter_positive","initial_slope_nonnegative","target_interval","current_constant_nonnegative","zero_in_source","radius_positive","target_upper_end_nonpositive","initial_constant_nonnegative","constant_terms_nonnegative"],"input_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1296121037/536870912","radicand":"2","rational_part":"-1","sqrt_coefficient":"-1","text":"-1 - sqrt(2)","upper_bound":"-10368968295/4294967296"}},"upper":{"closed":true,"value":{"lower_bound":"0","radicand":"1","rational_part":"0","sqrt_coefficient":"0","text":"0","upper_bound":"0"}}},"nonnegative_coefficients":true,"output_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1564556493/268435456","radicand":"2","rational_part":"-3","sqrt_coefficient":"-2","text":"-3 - 2 sqrt(2)","upper_bound":"-12516451943/2147483648"}},"upper":{"closed":true,"value":{"lower_bound":"-368449945/2147483648","radicand":"2","rational_part":"-3","sqrt_coefficient":"2","text":"-3 + 2 sqrt(2)","upper_bound":"-46056243/268435456"}}},"sharp":false,"statement":"every PF input with all roots in [-1 - sqrt(2), 0] has a PF image; no larger [-R, 0] works"},"identity":{"certificate":{"basis":{"family":{"first_index":0,"initial_polynomials":[["1"],["1","1"]],"recurrence":{"terms":[{"coeff":{"coeffs":[["1","1"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["0","1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"name":"A008288"},"coefficient_family":{"first_index":1,"initial_polynomials":[["1"],["1","2"]],"recurrence":{"denominator":{"coeffs":[["1"],["-1"]]},"terms":[{"coeff":{"coeffs":[["3","6"],["-2","-4"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["-2"],["1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"direction":"input_by_transported","exceptional_bases":[],"input":{"first_index":1,"initial_polynomials":[["1"],["3","2"],["13","24","6"],["63","202","130","20"]],"recurrence":{"denominator":{"coeffs":[["-14"],["25"],["-13"],["2"]]},"terms":[{"coeff":{"coeffs":[["36"],["-45"],["17"],["-2"]]},"deriv_order":0,"offset":4,"sign":"none"},{"coeff":{"coeffs":[["-252","-126"],["324","162"],["-128","-64"],["16","8"]]},"deriv_order":0,"offset":3,"sign":"none"},{"coeff":{"coeffs":[["370","-210"],["-498","284"],["210","-120"],["-28","16"]]},"deriv_order":0,"offset":2,"sign":"none"},{"coeff":{"coeffs":[["-168","-84"],["244","122"],["-112","-56"],["16","8"]]},"deriv_order":0,"offset":1,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"multiplier":["-6","-11","-6","-1"],"quotients":[{"row":[[{"coeff":{"coeffs":[["30"],["97"],["119"],["69"],["19"],["2"]]},"deriv_order":0}],[]],"shift":0},{"row":[[{"coeff":{"coeffs":[["-90","-60"],["-381","-254"],["-558","-372"],["-363","-242"],["-108","-72"],["-12","-8"]]},"deriv_order":0}],[{"coeff":{"coeffs":[["60"],["254"],["372"],["242"],["72"],["8"]]},"deriv_order":0}]],"shift":1},{"row":[[{"coeff":{"coeffs":[["12"],["52"],["79"],["54"],["17"],["2"]]},"deriv_order":0}],[]],"shift":2}]},"status":"certified"},"input":{"first_index":1,"initial_polynomials":[["1"],["3","2"],["13","24","6"],["63","202","130","20"]],"recurrence":{"denominator":{"coeffs":[["-14"],["25"],["-13"],["2"]]},"terms":[{"coeff":{"coeffs":[["36"],["-45"],["17"],["-2"]]},"deriv_order":0,"offset":4,"sign":"none"},{"coeff":{"coeffs":[["-252","-126"],["324","162"],["-128","-64"],["16","8"]]},"deriv_order":0,"offset":3,"sign":"none"},{"coeff":{"coeffs":[["370","-210"],["-498","284"],["210","-120"],["-28","16"]]},"deriv_order":0,"offset":2,"sign":"none"},{"coeff":{"coeffs":[["-168","-84"],["244","122"],["-112","-56"],["16","8"]]},"deriv_order":0,"offset":1,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"lift_summary":{"hypotheses":[{"evidence":"exact","name":"characteristic_parameter_positive","statement":"K = beta^2 + a beta - c = 2 > 0","status":{"kind":"verified"}},{"evidence":"exact","name":"initial_slope_nonnegative","statement":"eta = m/d = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"target_interval","statement":"2 eta - 1 = 1 >= 0 and (s - (2 eta - 1) beta)^2 <= (2 eta - 1)^2 K, s = 0","status":{"kind":"verified"}},{"evidence":"exact","name":"current_constant_nonnegative","statement":"a = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"zero_in_source","statement":"K >= beta^2 (2 >= 1)","status":{"kind":"verified"}},{"evidence":"exact","name":"radius_positive","statement":"R = beta + sqrt(K) = 1 + sqrt(2) > 0","status":{"kind":"verified"}},{"evidence":"exact","name":"target_upper_end_nonpositive","statement":"a + 2 beta = 3 >= 0 and a^2 + 4c = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"initial_constant_nonnegative","statement":"l = 1 >= 0","status":{"kind":"verified"}},{"evidence":"a^2 + 4c = 1 >= 0: true; 2s >= a or c >= s^2 - a s: true","name":"constant_terms_nonnegative","statement":"2l >= a or c >= l^2 - a l (with a^2 + 4c >= 0): every P_k(0) >= 0","status":{"kind":"verified"}}],"identity":{"method":"basis_map_division_input_by_transported","status":"certified"},"input_first_index":1,"input_interlacing":{"reason":"the map theorem does not prove that T_P preserves real-rootedness on the whole line","status":"not_proved"},"lean_replay":"not_attempted","operation":{"basis":"A008288","basis_family":{"first_index":0,"initial_polynomials":[["1"],["1","1"]],"recurrence":{"terms":[{"coeff":{"coeffs":[["1","1"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["0","1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"kind":"basis_map","source_interval":"[-1 - sqrt(2), 0]","target_interval":"[-3 - 2 sqrt(2), -3 + 2 sqrt(2)]"},"parent":{"index_shift":0,"recurrence":{"first_index":1,"initial_polynomials":[["1"],["1","2"]],"recurrence":{"denominator":{"coeffs":[["1"],["-1"]]},"terms":[{"coeff":{"coeffs":[["3","6"],["-2","-4"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["-2"],["1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"relation":"Q_n = T_P(R_n), T_P(u^k) = P_(0 + k), P the basis family A008288"},"parent_proof":{"route":"basis_map_coefficient_roots(three_term_recurrence, three_term_recurrence)","statement":"every coefficient row R_n, n >= 1, is zero or real-rooted with every root in [-1, 0]","status":"proved"},"root_transfer":{"input_conclusion":"every input row Q_n, n >= 1, is zero or real-rooted with every root in [-3 - 2 sqrt(2), -3 + 2 sqrt(2)] (nonnegative coefficients when the coefficient row has a positive leading coefficient)","input_root_region":{"lower":{"closed":true,"exact":{"radicand":"2","rational_part":"-3","sqrt_coefficient":"-2"},"value":"-1564556493/268435456"},"upper":{"closed":true,"exact":{"radicand":"2","rational_part":"-3","sqrt_coefficient":"2"},"value":"-46056243/268435456"}},"parent_hypothesis":"every coefficient row R_n is zero or real-rooted with every root in the source interval of the map theorem","parent_root_region":{"lower":{"closed":true,"value":"-1"},"upper":{"closed":true,"value":"0"}},"theorem":"affine current multiplier with an affine initial row (module documentation, \"The affine-current theorem\"): with beta = b/d, K = beta^2 + a beta - c > 0 and eta = m/d >= 0, every real polynomial with all roots in E = [-beta - sqrt(K), -beta + sqrt(K)] has a real-rooted image, and no interval of positive length outside E works (Theorem 1); for eta > 0 the images lie in I = [(-a - 2 beta - 2 sqrt(K))/d, (-a - 2 beta + 2 sqrt(K))/d] if and only if eta >= 1/2 and (s - (2 eta - 1) beta)^2 <= (2 eta - 1)^2 K, s = l - eta a (Theorem 2); with a >= 0, K >= beta^2, a + 2 beta >= 0, a^2 + 4c >= 0, l >= 0 and the scalar criterion, PF inputs with roots in [-R, 0], R = beta + sqrt(K), have PF images, sharply (the common-interlacer proof; the Chebyshev case is Iserles and Saff, Math. Proc. Cambridge Philos. Soc. 105 (1989), Theorem 1; the scalar criterion is RealRooted orderTwoConstants_nonneg_iff)"},"verdict":"proved"},"map_theorem":{"basis":{"first_index":0,"initial_polynomials":[["1"],["1","1"]],"recurrence":{"terms":[{"coeff":{"coeffs":[["1","1"]]},"deriv_order":0,"offset":1,"sign":"none"},{"coeff":{"coeffs":[["0","1"]]},"deriv_order":0,"offset":2,"sign":"none"}]},"schema":"polytool.recurrence.v1"},"basis_name":"A008288","conclusions":[{"hypotheses":["characteristic_parameter_positive","initial_slope_nonnegative"],"input_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1296121037/536870912","radicand":"2","rational_part":"-1","sqrt_coefficient":"-1","text":"-1 - sqrt(2)","upper_bound":"-10368968295/4294967296"}},"upper":{"closed":true,"value":{"lower_bound":"1779033703/4294967296","radicand":"2","rational_part":"-1","sqrt_coefficient":"1","text":"-1 + sqrt(2)","upper_bound":"222379213/536870912"}}},"nonnegative_coefficients":false,"output_interval":{},"sharp":false,"statement":"every real polynomial with all roots in E = [-1 - sqrt(2), -1 + sqrt(2)] has a real-rooted image"},{"hypotheses":["characteristic_parameter_positive","initial_slope_nonnegative","target_interval"],"input_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1296121037/536870912","radicand":"2","rational_part":"-1","sqrt_coefficient":"-1","text":"-1 - sqrt(2)","upper_bound":"-10368968295/4294967296"}},"upper":{"closed":true,"value":{"lower_bound":"1779033703/4294967296","radicand":"2","rational_part":"-1","sqrt_coefficient":"1","text":"-1 + sqrt(2)","upper_bound":"222379213/536870912"}}},"nonnegative_coefficients":false,"output_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1564556493/268435456","radicand":"2","rational_part":"-3","sqrt_coefficient":"-2","text":"-3 - 2 sqrt(2)","upper_bound":"-12516451943/2147483648"}},"upper":{"closed":true,"value":{"lower_bound":"-368449945/2147483648","radicand":"2","rational_part":"-3","sqrt_coefficient":"2","text":"-3 + 2 sqrt(2)","upper_bound":"-46056243/268435456"}}},"sharp":false,"statement":"every real polynomial with all roots in E = [-1 - sqrt(2), -1 + sqrt(2)] has an image with all roots in I = [-3 - 2 sqrt(2), -3 + 2 sqrt(2)]"},{"hypotheses":["characteristic_parameter_positive","initial_slope_nonnegative","target_interval","current_constant_nonnegative","zero_in_source","radius_positive","target_upper_end_nonpositive","initial_constant_nonnegative","constant_terms_nonnegative"],"input_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1296121037/536870912","radicand":"2","rational_part":"-1","sqrt_coefficient":"-1","text":"-1 - sqrt(2)","upper_bound":"-10368968295/4294967296"}},"upper":{"closed":true,"value":{"lower_bound":"0","radicand":"1","rational_part":"0","sqrt_coefficient":"0","text":"0","upper_bound":"0"}}},"nonnegative_coefficients":true,"output_interval":{"lower":{"closed":true,"value":{"lower_bound":"-1564556493/268435456","radicand":"2","rational_part":"-3","sqrt_coefficient":"-2","text":"-3 - 2 sqrt(2)","upper_bound":"-12516451943/2147483648"}},"upper":{"closed":true,"value":{"lower_bound":"-368449945/2147483648","radicand":"2","rational_part":"-3","sqrt_coefficient":"2","text":"-3 + 2 sqrt(2)","upper_bound":"-46056243/268435456"}}},"sharp":false,"statement":"every PF input with all roots in [-1 - sqrt(2), 0] has a PF image; no larger [-R, 0] works"}],"hypotheses":[{"evidence":"exact","name":"characteristic_parameter_positive","statement":"K = beta^2 + a beta - c = 2 > 0","status":{"kind":"verified"}},{"evidence":"exact","name":"initial_slope_nonnegative","statement":"eta = m/d = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"target_interval","statement":"2 eta - 1 = 1 >= 0 and (s - (2 eta - 1) beta)^2 <= (2 eta - 1)^2 K, s = 0","status":{"kind":"verified"}},{"evidence":"exact","name":"current_constant_nonnegative","statement":"a = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"zero_in_source","statement":"K >= beta^2 (2 >= 1)","status":{"kind":"verified"}},{"evidence":"exact","name":"radius_positive","statement":"R = beta + sqrt(K) = 1 + sqrt(2) > 0","status":{"kind":"verified"}},{"evidence":"exact","name":"target_upper_end_nonpositive","statement":"a + 2 beta = 3 >= 0 and a^2 + 4c = 1 >= 0","status":{"kind":"verified"}},{"evidence":"exact","name":"initial_constant_nonnegative","statement":"l = 1 >= 0","status":{"kind":"verified"}},{"evidence":"a^2 + 4c = 1 >= 0: true; 2s >= a or c >= s^2 - a s: true","name":"constant_terms_nonnegative","statement":"2l >= a or c >= l^2 - a l (with a^2 + 4c >= 0): every P_k(0) >= 0","status":{"kind":"verified"}}],"lean_declarations":["RealRooted.orderTwoConstants_nonneg_iff"],"lean_replay":"not_attempted","schema":"polytool.recurrence-basis-map-theorem.v1","shape":{"a":"1","b":"1","c":"0","d":"1","initial_constant":"1","initial_slope":"1","kind":"affine_current","normalization":"1"},"status":"proved","theorem":"affine current multiplier with an affine initial row (module documentation, \"The affine-current theorem\"): with beta = b/d, K = beta^2 + a beta - c > 0 and eta = m/d >= 0, every real polynomial with all roots in E = [-beta - sqrt(K), -beta + sqrt(K)] has a real-rooted image, and no interval of positive length outside E works (Theorem 1); for eta > 0 the images lie in I = [(-a - 2 beta - 2 sqrt(K))/d, (-a - 2 beta + 2 sqrt(K))/d] if and only if eta >= 1/2 and (s - (2 eta - 1) beta)^2 <= (2 eta - 1)^2 K, s = l - eta a (Theorem 2); with a >= 0, K >= beta^2, a + 2 beta >= 0, a^2 + 4c >= 0, l >= 0 and the scalar criterion, PF inputs with roots in [-R, 0], R = beta + sqrt(K), have PF images, sharply (the common-interlacer proof; the Chebyshev case is Iserles and Saff, Math. Proc. Cambridge Philos. Soc. 105 (1989), Theorem 1; the scalar criterion is RealRooted orderTwoConstants_nonneg_iff)"},"schema":"polytool.recurrence-basis-map-lift.v1"},"kind":"basis_map"}