/* This code can be loaded, or copied and pasted, into Magma. It will load the data associated to the HMF, including the field, level, and Hecke and Atkin-Lehner eigenvalue data. At the *bottom* of the file, there is code to recreate the Hilbert modular form in Magma, by creating the HMF space and cutting out the corresponding Hecke irreducible subspace. From there, you can ask for more eigenvalues or modify as desired. It is commented out, as this computation may be lengthy. */ P := PolynomialRing(Rationals()); g := P![25, 5, -11, -1, 1]; F := NumberField(g); ZF := Integers(F); NN := ideal; primesArray := [ [5, 5, 1/5*w^3 + 4/5*w^2 - 11/5*w - 7], [5, 5, 1/5*w^3 - 6/5*w^2 - 1/5*w + 4], [11, 11, w + 1], [11, 11, 1/5*w^3 - 1/5*w^2 - 11/5*w + 2], [16, 2, 2], [19, 19, -1/5*w^3 + 1/5*w^2 + 1/5*w + 1], [19, 19, 1/5*w^3 - 1/5*w^2 - 11/5*w], [19, 19, -2/5*w^3 + 2/5*w^2 + 17/5*w], [19, 19, w - 1], [29, 29, w^2 - w - 8], [29, 29, 2/5*w^3 - 2/5*w^2 - 7/5*w + 2], [31, 31, 1/5*w^3 - 1/5*w^2 - 1/5*w + 2], [31, 31, 2/5*w^3 - 2/5*w^2 - 17/5*w + 3], [61, 61, -2/5*w^3 - 3/5*w^2 + 12/5*w + 5], [61, 61, -4/5*w^3 - 6/5*w^2 + 39/5*w + 15], [61, 61, 3/5*w^3 + 2/5*w^2 - 18/5*w - 3], [61, 61, 7/5*w^3 + 3/5*w^2 - 62/5*w - 13], [71, 71, 1/5*w^3 - 6/5*w^2 - 6/5*w + 4], [71, 71, w^2 - 8], [79, 79, 3/5*w^3 + 12/5*w^2 - 33/5*w - 22], [79, 79, 1/5*w^3 + 4/5*w^2 - 11/5*w - 9], [81, 3, -3], [101, 101, 3/5*w^3 + 7/5*w^2 - 28/5*w - 15], [101, 101, 1/5*w^3 + 9/5*w^2 - 16/5*w - 16], [121, 11, 3/5*w^3 - 3/5*w^2 - 18/5*w + 1], [131, 131, 1/5*w^3 + 4/5*w^2 - 16/5*w - 8], [131, 131, w^2 - 2*w - 2], [149, 149, 4/5*w^3 + 1/5*w^2 - 29/5*w - 5], [149, 149, 4/5*w^3 - 9/5*w^2 - 19/5*w + 6], [151, 151, 2/5*w^3 + 3/5*w^2 - 17/5*w - 3], [151, 151, -2/5*w^3 + 7/5*w^2 + 7/5*w - 8], [151, 151, 4/5*w^3 + 1/5*w^2 - 29/5*w - 2], [151, 151, -4/5*w^3 + 9/5*w^2 + 19/5*w - 9], [179, 179, -3/5*w^3 + 8/5*w^2 + 18/5*w - 6], [179, 179, 2/5*w^3 + 3/5*w^2 - 12/5*w - 6], [211, 211, 1/5*w^3 + 4/5*w^2 - 6/5*w - 10], [211, 211, 2/5*w^3 - 7/5*w^2 - 12/5*w + 2], [229, 229, 6/5*w^3 - 11/5*w^2 - 41/5*w + 11], [229, 229, 2*w^2 - 2*w - 9], [229, 229, -4/5*w^3 - 1/5*w^2 + 19/5*w + 2], [229, 229, -3/5*w^3 + 3/5*w^2 + 28/5*w - 3], [239, 239, 11/5*w^3 + 4/5*w^2 - 96/5*w - 19], [239, 239, -6/5*w^3 + 1/5*w^2 + 51/5*w + 3], [241, 241, 1/5*w^3 + 4/5*w^2 - 1/5*w - 6], [241, 241, 4/5*w^3 - 4/5*w^2 - 29/5*w - 1], [251, 251, -1/5*w^3 + 6/5*w^2 + 11/5*w - 12], [251, 251, -1/5*w^3 + 11/5*w^2 + 1/5*w - 15], [269, 269, 2/5*w^3 + 3/5*w^2 - 17/5*w - 2], [269, 269, -2/5*w^3 + 7/5*w^2 + 7/5*w - 9], [271, 271, 1/5*w^3 - 1/5*w^2 + 4/5*w], [271, 271, 3/5*w^3 - 3/5*w^2 - 28/5*w + 2], [281, 281, w^3 - 3*w^2 - 4*w + 13], [281, 281, -3/5*w^3 + 3/5*w^2 + 28/5*w - 6], [281, 281, -6/5*w^3 + 26/5*w^2 + 11/5*w - 16], [281, 281, w^3 + w^2 - 8*w - 9], [289, 17, 2/5*w^3 + 3/5*w^2 - 7/5*w - 5], [289, 17, 4/5*w^3 - 9/5*w^2 - 29/5*w + 8], [311, 311, -w^2 + 2*w + 11], [311, 311, -1/5*w^3 + 6/5*w^2 + 1/5*w - 1], [311, 311, 1/5*w^3 + 4/5*w^2 - 16/5*w + 1], [311, 311, -1/5*w^3 - 4/5*w^2 + 11/5*w + 10], [349, 349, -1/5*w^3 - 9/5*w^2 + 11/5*w + 16], [349, 349, 2/5*w^3 - 12/5*w^2 - 7/5*w + 7], [359, 359, -4/5*w^3 + 4/5*w^2 + 19/5*w - 1], [359, 359, -w^3 + 3*w^2 + 5*w - 12], [359, 359, w^3 - w^2 - 7*w + 2], [359, 359, 4/5*w^3 + 6/5*w^2 - 29/5*w - 11], [379, 379, 4/5*w^3 + 6/5*w^2 - 34/5*w - 9], [379, 379, 3/5*w^3 - 3/5*w^2 - 28/5*w + 7], [389, 389, w^2 - 3*w - 8], [389, 389, -4/5*w^3 + 14/5*w^2 + 19/5*w - 16], [401, 401, -3*w^2 + 2*w + 23], [401, 401, 1/5*w^3 - 16/5*w^2 + 4/5*w + 11], [409, 409, -w^3 + 2*w^2 + 3*w - 7], [409, 409, 7/5*w^3 - 2/5*w^2 - 57/5*w - 2], [419, 419, -1/5*w^3 + 1/5*w^2 + 16/5*w - 2], [419, 419, 1/5*w^3 - 1/5*w^2 - 16/5*w], [421, 421, 2/5*w^3 + 3/5*w^2 - 27/5*w - 3], [421, 421, 1/5*w^3 + 4/5*w^2 + 4/5*w - 3], [439, 439, -w^3 + 3*w^2 + 5*w - 16], [439, 439, -4/5*w^3 - 6/5*w^2 + 29/5*w + 7], [439, 439, -3/5*w^3 + 13/5*w^2 + 3/5*w - 11], [439, 439, 4/5*w^3 + 6/5*w^2 - 39/5*w - 10], [449, 449, 2/5*w^3 - 12/5*w^2 - 2/5*w + 5], [449, 449, 4/5*w^3 - 24/5*w^2 - 4/5*w + 15], [461, 461, -1/5*w^3 - 4/5*w^2 - 4/5*w + 4], [461, 461, 2*w^2 - 2*w - 11], [461, 461, 3/5*w^3 + 2/5*w^2 - 33/5*w - 4], [479, 479, -w^3 + 3*w^2 + 6*w - 14], [479, 479, -3/5*w^3 + 3/5*w^2 + 28/5*w + 3], [499, 499, 2/5*w^3 + 8/5*w^2 - 17/5*w - 6], [499, 499, -3/5*w^3 + 13/5*w^2 + 13/5*w - 17], [509, 509, -w^3 + 2*w^2 + 4*w - 6], [509, 509, 6/5*w^3 - 1/5*w^2 - 46/5*w - 4], [521, 521, -2/5*w^3 + 2/5*w^2 + 7/5*w - 7], [521, 521, -3/5*w^3 + 3/5*w^2 + 23/5*w - 8], [529, 23, -7/5*w^3 + 17/5*w^2 + 42/5*w - 15], [529, 23, 2/5*w^3 + 13/5*w^2 - 27/5*w - 21], [541, 541, 1/5*w^3 - 11/5*w^2 - 1/5*w + 10], [541, 541, 3/5*w^3 - 8/5*w^2 - 13/5*w + 13], [541, 541, -2*w^2 + w + 13], [541, 541, 3/5*w^3 + 2/5*w^2 - 23/5*w + 2], [569, 569, w^3 - 2*w^2 - 5*w + 7], [569, 569, -1/5*w^3 + 1/5*w^2 + 1/5*w - 6], [571, 571, w^2 + w - 9], [571, 571, -2/5*w^3 + 12/5*w^2 + 7/5*w - 12], [571, 571, 1/5*w^3 + 9/5*w^2 - 11/5*w - 11], [571, 571, -2/5*w^3 + 7/5*w^2 + 17/5*w - 4], [601, 601, -3/5*w^3 + 13/5*w^2 + 18/5*w - 11], [601, 601, -4/5*w^3 + 4/5*w^2 + 34/5*w + 1], [631, 631, 2/5*w^3 + 18/5*w^2 - 27/5*w - 30], [631, 631, 3/5*w^3 - 23/5*w^2 - 3/5*w + 15], [661, 661, -2*w^3 + 17*w + 12], [661, 661, -9/5*w^3 + 4/5*w^2 + 74/5*w + 1], [691, 691, -7/5*w^3 - 18/5*w^2 + 72/5*w + 35], [691, 691, 6/5*w^3 - 31/5*w^2 - 6/5*w + 19], [701, 701, -1/5*w^3 + 6/5*w^2 + 16/5*w - 6], [701, 701, 2/5*w^3 - 7/5*w^2 - 22/5*w + 8], [709, 709, -3/5*w^3 + 13/5*w^2 + 13/5*w - 18], [709, 709, 1/5*w^3 + 14/5*w^2 - 11/5*w - 20], [709, 709, -2/5*w^3 - 8/5*w^2 + 17/5*w + 5], [709, 709, 1/5*w^3 + 4/5*w^2 - 21/5*w - 10], [719, 719, -3/5*w^3 + 8/5*w^2 + 13/5*w - 12], [719, 719, 3/5*w^3 + 2/5*w^2 - 23/5*w + 1], [719, 719, -7/5*w^3 + 17/5*w^2 + 32/5*w - 14], [719, 719, 7/5*w^3 + 3/5*w^2 - 52/5*w - 8], [739, 739, 1/5*w^3 - 1/5*w^2 - 11/5*w - 5], [739, 739, w - 6], [761, 761, -4/5*w^3 + 9/5*w^2 + 19/5*w - 11], [761, 761, 4/5*w^3 + 1/5*w^2 - 29/5*w], [769, 769, 3/5*w^3 - 13/5*w^2 - 13/5*w + 8], [769, 769, -2/5*w^3 - 8/5*w^2 + 17/5*w + 15], [769, 769, 7/5*w^3 - 17/5*w^2 - 37/5*w + 18], [769, 769, -6/5*w^3 - 4/5*w^2 + 41/5*w + 5], [809, 809, -1/5*w^3 + 6/5*w^2 - 4/5*w - 14], [809, 809, -2/5*w^3 - 3/5*w^2 + 22/5*w - 4], [809, 809, -6/5*w^3 + 6/5*w^2 + 41/5*w - 5], [809, 809, w^3 - w^2 - 5*w + 4], [821, 821, -3/5*w^3 - 17/5*w^2 + 33/5*w + 30], [821, 821, -4/5*w^3 + 24/5*w^2 + 9/5*w - 15], [829, 829, 7/5*w^3 - 12/5*w^2 - 52/5*w + 10], [829, 829, -1/5*w^3 + 11/5*w^2 - 4/5*w - 19], [829, 829, -13/5*w^3 + 3/5*w^2 + 108/5*w + 10], [829, 829, -w^3 + 4*w^2 + 5*w - 23], [839, 839, 4/5*w^3 - 9/5*w^2 - 24/5*w + 4], [839, 839, 3/5*w^3 + 2/5*w^2 - 18/5*w - 8], [841, 29, -w^3 + w^2 + 6*w - 4], [859, 859, 6/5*w^3 - 11/5*w^2 - 36/5*w + 9], [859, 859, w^3 - 6*w - 3], [881, 881, 4/5*w^3 - 4/5*w^2 - 9/5*w - 1], [881, 881, 9/5*w^3 - 24/5*w^2 - 19/5*w + 14], [881, 881, -w^3 + 6*w + 2], [881, 881, 1/5*w^3 - 1/5*w^2 - 1/5*w - 6], [911, 911, w^3 - w^2 - 5*w + 1], [911, 911, 6/5*w^3 - 6/5*w^2 - 41/5*w + 2], [919, 919, -7/5*w^3 + 12/5*w^2 + 42/5*w - 7], [919, 919, -6/5*w^3 + 1/5*w^2 + 36/5*w + 5], [929, 929, -2/5*w^3 - 8/5*w^2 + 17/5*w + 16], [929, 929, -3/5*w^3 + 13/5*w^2 + 13/5*w - 7], [961, 31, w^3 - w^2 - 6*w + 2], [971, 971, 8/5*w^3 - 13/5*w^2 - 48/5*w + 6], [971, 971, -2/5*w^3 - 3/5*w^2 + 22/5*w], [971, 971, 7/5*w^3 - 7/5*w^2 - 57/5*w + 7], [971, 971, -1/5*w^3 + 6/5*w^2 - 4/5*w - 10], [991, 991, 2/5*w^3 + 8/5*w^2 - 22/5*w - 7], [991, 991, -2/5*w^3 + 12/5*w^2 + 2/5*w - 15]]; primes := [ideal : I in primesArray]; heckePol := x^7 - 4*x^6 - 29*x^5 + 81*x^4 + 207*x^3 - 429*x^2 - 197*x - 12; K := NumberField(heckePol); heckeEigenvaluesArray := [1, 1, e, e, -314/9127*e^6 + 2016/9127*e^5 + 7482/9127*e^4 - 48194/9127*e^3 - 53049/9127*e^2 + 255780/9127*e + 74861/9127, -157/9127*e^6 + 1008/9127*e^5 + 3741/9127*e^4 - 24097/9127*e^3 - 31088/9127*e^2 + 137017/9127*e + 60248/9127, 59/9127*e^6 - 30/9127*e^5 - 3208/9127*e^4 + 5335/9127*e^3 + 27437/9127*e^2 - 69977/9127*e + 380/9127, -157/9127*e^6 + 1008/9127*e^5 + 3741/9127*e^4 - 24097/9127*e^3 - 31088/9127*e^2 + 137017/9127*e + 60248/9127, 59/9127*e^6 - 30/9127*e^5 - 3208/9127*e^4 + 5335/9127*e^3 + 27437/9127*e^2 - 69977/9127*e + 380/9127, 655/9127*e^6 - 1880/9127*e^5 - 21537/9127*e^4 + 36178/9127*e^3 + 155626/9127*e^2 - 211144/9127*e - 79626/9127, 655/9127*e^6 - 1880/9127*e^5 - 21537/9127*e^4 + 36178/9127*e^3 + 155626/9127*e^2 - 211144/9127*e - 79626/9127, 445/9127*e^6 - 2392/9127*e^5 - 9964/9127*e^4 + 48128/9127*e^3 + 51317/9127*e^2 - 239596/9127*e + 5960/9127, 445/9127*e^6 - 2392/9127*e^5 - 9964/9127*e^4 + 48128/9127*e^3 + 51317/9127*e^2 - 239596/9127*e + 5960/9127, 625/9127*e^6 - 3257/9127*e^5 - 17276/9127*e^4 + 75697/9127*e^3 + 138117/9127*e^2 - 430345/9127*e - 153454/9127, 625/9127*e^6 - 3257/9127*e^5 - 17276/9127*e^4 + 75697/9127*e^3 + 138117/9127*e^2 - 430345/9127*e - 153454/9127, 1640/9127*e^6 - 6867/9127*e^5 - 44310/9127*e^4 + 130505/9127*e^3 + 284803/9127*e^2 - 630526/9127*e - 168574/9127, 1640/9127*e^6 - 6867/9127*e^5 - 44310/9127*e^4 + 130505/9127*e^3 + 284803/9127*e^2 - 630526/9127*e - 168574/9127, -1539/9127*e^6 + 5114/9127*e^5 + 46089/9127*e^4 - 91052/9127*e^3 - 313171/9127*e^2 + 473144/9127*e + 166440/9127, -1539/9127*e^6 + 5114/9127*e^5 + 46089/9127*e^4 - 91052/9127*e^3 - 313171/9127*e^2 + 473144/9127*e + 166440/9127, -285/9127*e^6 + 609/9127*e^5 + 8535/9127*e^4 - 3340/9127*e^3 - 52248/9127*e^2 - 24271/9127*e + 47048/9127, -285/9127*e^6 + 609/9127*e^5 + 8535/9127*e^4 - 3340/9127*e^3 - 52248/9127*e^2 - 24271/9127*e + 47048/9127, -730/9127*e^6 + 3001/9127*e^5 + 18499/9127*e^4 - 51468/9127*e^3 - 103565/9127*e^2 + 233579/9127*e + 132358/9127, -2115/9127*e^6 + 7882/9127*e^5 + 58535/9127*e^4 - 139114/9127*e^3 - 362756/9127*e^2 + 669175/9127*e + 161802/9127, -2115/9127*e^6 + 7882/9127*e^5 + 58535/9127*e^4 - 139114/9127*e^3 - 362756/9127*e^2 + 669175/9127*e + 161802/9127, -2157/9127*e^6 + 9605/9127*e^5 + 62675/9127*e^4 - 218867/9127*e^3 - 443856/9127*e^2 + 1267692/9127*e + 292094/9127, -586/9127*e^6 + 2309/9127*e^5 + 19951/9127*e^4 - 62270/9127*e^3 - 161903/9127*e^2 + 415028/9127*e + 110700/9127, -586/9127*e^6 + 2309/9127*e^5 + 19951/9127*e^4 - 62270/9127*e^3 - 161903/9127*e^2 + 415028/9127*e + 110700/9127, 272/9127*e^6 - 293/9127*e^5 - 12469/9127*e^4 + 14076/9127*e^3 + 99727/9127*e^2 - 168375/9127*e + 28050/9127, 272/9127*e^6 - 293/9127*e^5 - 12469/9127*e^4 + 14076/9127*e^3 + 99727/9127*e^2 - 168375/9127*e + 28050/9127, -259/9127*e^6 - 23/9127*e^5 + 7276/9127*e^4 + 20823/9127*e^3 - 19428/9127*e^2 - 177472/9127*e - 66640/9127, -259/9127*e^6 - 23/9127*e^5 + 7276/9127*e^4 + 20823/9127*e^3 - 19428/9127*e^2 - 177472/9127*e - 66640/9127, -157/9127*e^6 + 1008/9127*e^5 + 3741/9127*e^4 - 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67093/9127*e^4 + 108468/9127*e^3 + 446892/9127*e^2 - 580740/9127*e - 2898/9127, 2096/9127*e^6 - 6016/9127*e^5 - 67093/9127*e^4 + 108468/9127*e^3 + 446892/9127*e^2 - 580740/9127*e - 2898/9127, -3274/9127*e^6 + 12184/9127*e^5 + 84117/9127*e^4 - 183120/9127*e^3 - 451104/9127*e^2 + 697034/9127*e + 107310/9127, -3274/9127*e^6 + 12184/9127*e^5 + 84117/9127*e^4 - 183120/9127*e^3 - 451104/9127*e^2 + 697034/9127*e + 107310/9127, -486/9127*e^6 + 6899/9127*e^5 - 337/9127*e^4 - 166619/9127*e^3 + 12069/9127*e^2 + 862761/9127*e + 162084/9127, -486/9127*e^6 + 6899/9127*e^5 - 337/9127*e^4 - 166619/9127*e^3 + 12069/9127*e^2 + 862761/9127*e + 162084/9127, -562/9127*e^6 - 3891/9127*e^5 + 29320/9127*e^4 + 130639/9127*e^3 - 171626/9127*e^2 - 636280/9127*e - 334048/9127, -562/9127*e^6 - 3891/9127*e^5 + 29320/9127*e^4 + 130639/9127*e^3 - 171626/9127*e^2 - 636280/9127*e - 334048/9127, -4993/9127*e^6 + 18163/9127*e^5 + 146645/9127*e^4 - 347376/9127*e^3 - 969726/9127*e^2 + 1780769/9127*e + 378402/9127, -4993/9127*e^6 + 18163/9127*e^5 + 146645/9127*e^4 - 347376/9127*e^3 - 969726/9127*e^2 + 1780769/9127*e + 378402/9127, 2468/9127*e^6 - 10846/9127*e^5 - 63342/9127*e^4 + 200735/9127*e^3 + 382892/9127*e^2 - 931145/9127*e + 204314/9127, 3424/9127*e^6 - 14426/9127*e^5 - 96295/9127*e^4 + 304970/9127*e^3 + 620792/9127*e^2 - 1691112/9127*e - 84996/9127, -320/9127*e^6 + 3566/9127*e^5 + 2858/9127*e^4 - 89576/9127*e^3 + 10989/9127*e^2 + 491226/9127*e - 142524/9127, 3424/9127*e^6 - 14426/9127*e^5 - 96295/9127*e^4 + 304970/9127*e^3 + 620792/9127*e^2 - 1691112/9127*e - 84996/9127, -320/9127*e^6 + 3566/9127*e^5 + 2858/9127*e^4 - 89576/9127*e^3 + 10989/9127*e^2 + 491226/9127*e - 142524/9127, 5516/9127*e^6 - 22451/9127*e^5 - 151259/9127*e^4 + 431485/9127*e^3 + 973471/9127*e^2 - 2215285/9127*e - 549220/9127, 5516/9127*e^6 - 22451/9127*e^5 - 151259/9127*e^4 + 431485/9127*e^3 + 973471/9127*e^2 - 2215285/9127*e - 549220/9127]; heckeEigenvalues := AssociativeArray(); for i := 1 to #heckeEigenvaluesArray do heckeEigenvalues[primes[i]] := heckeEigenvaluesArray[i]; end for; ALEigenvalues := AssociativeArray(); ALEigenvalues[ideal] := -1; ALEigenvalues[ideal] := -1; // EXAMPLE: // pp := Factorization(2*ZF)[1][1]; // heckeEigenvalues[pp]; print "To reconstruct the Hilbert newform f, type f, iso := Explode(make_newform());"; function make_newform(); M := HilbertCuspForms(F, NN); S := NewSubspace(M); // SetVerbose("ModFrmHil", 1); NFD := NewformDecomposition(S); newforms := [* Eigenform(U) : U in NFD *]; if #newforms eq 0 then; print "No Hilbert newforms at this level"; return 0; end if; print "Testing ", #newforms, " possible newforms"; newforms := [* f: f in newforms | IsIsomorphic(BaseField(f), K) *]; print #newforms, " newforms have the correct Hecke field"; if #newforms eq 0 then; print "No Hilbert newform found with the correct Hecke field"; return 0; end if; autos := Automorphisms(K); xnewforms := [* *]; for f in newforms do; if K eq RationalField() then; Append(~xnewforms, [* f, autos[1] *]); else; flag, iso := IsIsomorphic(K,BaseField(f)); for a in autos do; Append(~xnewforms, [* f, a*iso *]); end for; end if; end for; newforms := xnewforms; for P in primes do; xnewforms := [* *]; for f_iso in newforms do; f, iso := Explode(f_iso); if HeckeEigenvalue(f,P) eq iso(heckeEigenvalues[P]) then; Append(~xnewforms, f_iso); end if; end for; newforms := xnewforms; if #newforms eq 0 then; print "No Hilbert newform found which matches the Hecke eigenvalues"; return 0; else if #newforms eq 1 then; print "success: unique match"; return newforms[1]; end if; end if; end for; print #newforms, "Hilbert newforms found which match the Hecke eigenvalues"; return newforms[1]; end function;