13
In[1]:= dim = 6 H* This is dimension we are intersted in *L xx = Append@Array@x, dimD,x@0DD H* A set of inderetminates x@0D - homogenisation variable*L << Combinatorica` H* get monomials of degree n in first treating mn as first order monomials *L getMono@n_, mn_D := Block@8cc1<, Hcc1 = Compositions@n, Length@mnDD; Table@FromCoefficientRules@8cc1@@kDD 1<, mnD, 8k, Length@cc1D<DLD H* flatten the monomial, e.g. x^2 8x,x<, x^2y^3 8x,x,y,y,y<, etc. *L varList@mn_D := Block@8v<, Hv = Variables@mnD; Flatten@Table@ Table@v@@kDD, 8m, Exponent@mn, v@@kDDD<D, 8k, Length@vD<DDLD H* find all quadratic factors Hof degree d2L of the monomial mn, treating it as a monomial of degree d HddegreeHmnLL *L quadFactors@mn_, d_ D := Block@8vl, s<, Hvl = varList@mnD; vl = Flatten@8vl, Table@1, 8d - Length@vlD<D<D; s = Subsets@vl, 8Floor@Length@vlD 2D<D; Table@Product@s@@kDD@@mDD, 8m, Length@s@@kDDD < D, 8k, Length@sD<D LD H* find all quadratic decompositions of monomial mn Hof degree d2L treating mn as being a monomial of degree d HddegreeHmnLL *L quadDecomp@mn_, d_ D := Block@8qf<, Hqf = quadFactors@mn, d D; Union@ Table@Sort@8qf@@kDD, mn qf@@kDD<D, 8k, Length@qfD<DDLD H* find all quadratic tautologies H of degree d2 L for a monomial mn, treated as monomial of degree d, since all tautologies in the variables underlying mn are zeros we also need replarement rule rr that replaces monomials of degree d2 into new variables Hsee quadRRule belowL *L quadTautology@rr_, mn_, d_ D := Block@8qd, c1<, Hqd = quadDecomp@mn, dD. rr; c1 = qd@@1DD@@1DD * qd@@1DD@@2DD; Table@c1 - qd@@kDD@@1DD * qd@@kDD@@2DD, 8k, 2, Length@qdD<DLD H* this is helper function to enforce modofied GFH2L field with rules x@kD^2= 1, i.e. that has elements -1, +1 *LreducedForm@mn_D := Block@8v<, Hv = Variables@mnD; Product@ v@@kDD ^Mod@Exponent@mn, v@@kDDD ,2D, 8k, Length@vD<DL D H* get replacement rule for quadratic tautologies starting with first order monomials mn, and encoding variable in c *L quadRRule@mn_, c_D := Block@8 cc, mn2, lmn2, mnr, mnru, rr, mnr1, rr1<, H mn2 = Complement@getMono@2, mnD, 81<D; lmn2 = Length@mn2D; mnr = Table@reducedForm@mn2@@kDDD, 8k, lmn2<D; mnru = Complement@Union@mnrD, 81<D; cc = Table@c@kD, 8k, Length@mnruD<D; rr = Table@mnru@@kDD cc@@kDD, 8k, Length@mnruD<D; mnr1 = mnr . rr; rr1 = Table@ If@ Length@ Variables@mnr@@kDD D D 0, 1, mnr1@@kDD D , 8k, lmn2<D; 8cc, Table@mn2@@kDD rr1@@kDD, 8k, lmn2<D , mn2, rr1 < LD Out[1]= 6 Out[2]= 8x@1D,x@2D,x@3D,x@4D,x@5D,x@6D,x@0D< General::compat : Combinatorica Graph and Permutations functionality has been superseded by preloaded functionality. The package now being loaded may conflict with this. Please see the Compatibility Guide for details.

In[1]:= dim H This is dimension we are intersted in L D DD H D L

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  • In[1]:= dim = 6 H* This is dimension we are intersted in *Lxx = Append@Array@x, dimD, x@0DDH* A set of inderetminates x@0D - homogenisation variable*L

  • In[11]:= rr = quadRRule@xx, cD; H* replacement rule for squared homogenised variables x *Lrri = Flatten@

    Table@If@Length@Variables@rr@@4DD@@kDDDD > 0, rr@@4DD@@kDD ® rr@@3DD@@kDD , 8

  • In[29]:= 2023 - 1959 H* rank deficit,since we are inposing F_2 on 6 variables the expected max value is 2^6= 64 *L

    Out[29]= 64

    In[30]:= H* generate all 2^6 possible values of x to test they are in the null space *LxVal = Flatten@Table@8k1, k2, k3, k4, k5, k6, 2< * 2 - 3,

    8k1, 2

  • In[35]:= fx = Table@xx@@kDD^2 - x@0D^2, 8k, dim

  • --------------- Forth order -------------------

    Rank deficency

    57

    Norm of values

    0

    Rank of values

    57

    ---------------- Fifth order ------------------

    Rank deficency

    63

    Norm of values

    0

    Rank of values

    63

    ----------------- Sixth order -----------------

    Rank deficency

    64

    Norm of values

    0

    Rank of values

    64

    and now certificates for factoring first in ususal Nulstellensatz linear algebra

    In[43]:= ff = Expand@HSum@Hxx@@kDD + x@0DL 2^Hk - 1L, 8k, dim 2< D + x@0DLHSum@Hxx@@k + dim 2DD + x@0DL 2^Hk - 1L, 8k, dim 2< D + x@0DLD - 0

    Sort@Table@ ff . Table@xx@@kDD ® xVal@@mDD@@kDD, 8k, dim + 1

  • In[46]:= certEval@n_D := Block@ 8qM, fAll, cert, certRules, coefCond, ccca

  • Out[56]=

    A very large output was generated. Here is a sample of it:

    91, c@21D, c@21D2, c@21D3, c@20D, c@20D c@21D, c@20D c@21D2,c@20D2, c@20D2 c@21D, c@20D3, c@19D, c@19D c@21D, c@19D c@21D2,c@19D c@20D, c@19D c@20D c@21D, 1995, c@1D2 c@14D, c@1D2 c@13D,c@1D2 c@12D, c@1D2 c@11D, c@1D2 c@10D, c@1D2 c@9D, c@1D2 c@8D, c@1D2 c@7D,c@1D2 c@6D, c@1D2 c@5D, c@1D2 c@4D, c@1D2 c@3D, c@1D2 c@2D, c@1D3=

    Show Less Show More Show Full Output Set Size Limit...

    Out[57]= 4116

    Out[58]=

    A very large output was generated. Here is a sample of it:

    c@1D z@1D - c@1D3 z@1D + c@2D z@2D - c@1D2 c@2D z@2D + c@1D z@3D -c@1D c@2D2 z@3D + c@2D z@4D - c@2D3 z@4D - c@1D2 c@2D z@5D + c@1D c@3D z@5D +12 318 + c@19D z@4112D - c@19D c@21D2 z@4112D + c@14D c@21D z@4113D -c@19D c@21D2 z@4113D + c@20D z@4114D - c@20D c@21D2 z@4114D +c@15D c@21D z@4115D - c@20D c@21D2 z@4115D + c@21D z@4116D - c@21D3 z@4116D

    Show Less Show More Show Full Output Set Size Limit...

    Out[59]= 8c@1D, c@2D, c@4D, c@7D, c@8D, c@9D, c@10D,c@11D, c@12D, c@13D, c@14D, c@16D, c@17D, c@18D, c@19D<

    Out[61]=

    A very large output was generated. Here is a sample of it:

    883, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0< ® -z@1D,82, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0< ® -z@2D - z@5D,2021, 80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0< ® 1<

    Show Less Show More Show Full Output Set Size Limit...

    Out[62]= 2024

    Out[63]=

    A very large output was generated. Here is a sample of it:

    8-z@1D, -z@2D - z@5D, -z@6D + z@7D, -z@19D - z@29D, -z@30D + z@31D,2015, -z@4116D, z@4061D + z@4062D + z@4063D + z@4064D + z@4065D,z@3206D + z@3218D + z@3237D + z@3257D + z@3284D + z@3320D + z@3352D +

    z@3391D + z@3439D + z@3498D + z@3536D + z@3578D + z@3627D + z@3685D +z@3754D + z@3802D + z@3854D + z@3913D + z@3981D + z@4060D + z@4116D, 1<

    Show Less Show More Show Full Output Set Size Limit...

    Out[64]= 8SparseArray@, 82024

  • In[67]:= 2024 - 1959

    Out[67]= 65

    In[240]:= ffr2 =

    Flatten@Table@ Expand@Hffr@@kDD + ffr@@mDDL^3 - Hffr - ffr@@kDD - ffr@@mDDL^3 D,8k, Length@ffrD - 1

  • Out[249]=

    A very large output was generated. Here is a sample of it:

    8512 t@1D - 512 t@2D - 512 t@3D - 512 t@4D - 512 t@5D - 512 t@6D -512 t@7D - 512 t@8D - 512 t@9D - 512 t@10D - 512 t@11D - 512 t@12D -512 t@13D - 512 t@14D - 512 t@15D + 512 t@16D + 195 + 8 y@253D - z@1D,

    182 + 8 y@252D + 16 y@253D - z@2D - z@5D, 2020,64 y@2D + z@3206D + z@3218D + 17 + z@4060D + z@4116D, 1 + 262 144 t@1D + 262 144 t@2D +

    262 144 t@3D + 262 144 t@4D + 262 144 t@5D + 262 144 t@6D + 219 + 64 y@1D<

    Show Less Show More Show Full Output Set Size Limit...

    Out[250]=

    A very large output was generated. Here is a sample of it:

    8t@1D, t@2D, t@3D, t@4D, t@5D, t@6D, t@7D, t@8D, t@9D, t@10D, t@11D, t@12D, t@13D,t@14D, t@15D, t@16D, t@17D, t@18D, t@19D, t@20D, t@21D, t@22D, t@23D, t@24D,t@25D, 4439, z@4092D, z@4093D, z@4094D, z@4095D, z@4096D, z@4097D, z@4098D,z@4099D, z@4100D, z@4101D, z@4102D, z@4103D, z@4104D, z@4105D, z@4106D, z@4107D,z@4108D, z@4109D, z@4110D, z@4111D, z@4112D, z@4113D, z@4114D, z@4115D, z@4116D<

    Show Less Show More Show Full Output Set Size Limit...

    Out[251]= 8SparseArray@, 82024

  • Out[252]=

    -

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    1297

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    1297

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    1297

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    1297

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    1297

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    1297

    2 873 344, -

    1297

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    1297

    1 436 672, -

    1297

    2 873 344, -

    1297

    5 746 688, -

    1297

    1 436 672, 0, 0, 0, 0,

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    0, 0, -2561

    44 896, 0, 0, -

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    1 436 672, -

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    16 279

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    16 279

    718 336, 0, -

    16 279

    2 873 344,

    -

    16 279

    5 746 688, -

    16 279

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    16 279

    1 436 672, -

    16 279

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    0, 0, -1297

    89 792, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -

    4943

    718 336,

    0, 0,259

    359 168,

    259

    718 336,

    259

    1 436 672,

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    179 584, 0,

    259

    718 336,

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    259

    2 873 344,

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    359 168,

    259

    1 436 672,

    259

    2 873 344,

    259

    5 746 688,

    259

    718 336, 0, 0,

    25 431

    1 436 672, 0, -

    1297

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    25 431

    1 436 672, 0, 0,

    1151

    359 168,

    1151

    718 336,

    1151

    1 436 672,

    1151

    179 584, 0,

    1151

    718 336,

    1151

    1 436 672,

    1151

    2 873 344,

    1151

    359 168,

    1151

    1 436 672,

    1151

    2 873 344,

    1151

    5 746 688,

    1151

    718 336, 0, 0, -

    4943

    2 873 344, 0,

    -

    2561

    718 336, -

    1297

    1 436 672, -

    51

    2806, -

    1929

    22 448, -

    1929

    11 224, -

    951

    11 224, 0, 0, 0, 0, -

    1

    16, -

    1

    16,

    0, 0, 0, 0, 0, 0, 0, 0, -3479

    44 896,

    9443

    44 896, 0, 0, 0, 0, -

    3479

    11 224,

    9443

    22 448, 0, -

    1491

    11 224,

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    10 tautologies6vars4thOrder.nb

  • Out[252]=

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    tautologies6vars4thOrder.nb 11

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    In[212]:= MatrixRank@ ccca@@2DD D

    Out[212]= 120

    12 tautologies6vars4thOrder.nb

  • In[213]:= Length@ffr2D

    Out[213]= 120

    In[253]:= Length@lsD

    Out[253]= 4489

    tautologies6vars4thOrder.nb 13