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Ext.m2
-- total Ext R = ZZ/103[x,y]/(x^3,y^2) N = cokernel random (R^1, R^{-2,-2}) E = Ext(N,N,MinimalGenerators => false) S = ring E; E E2 = Ext^2(N,N,MinimalGenerators => false) E3 = Ext^3(N,N) assert( rank source basis( {-2,-4}, E) === rank source basis( {-4}, E2 ) ) assert( rank source basis( {-2,-3}, E) === rank source basis( {-3}, E2 ) ) assert( rank source basis( {-2,-2}, E) === rank source basis( {-2}, E2 ) ) assert( rank source basis( {-3,-4}, E) === rank source basis( {-4}, E3 ) ) assert( rank source basis( {-3,-3}, E) === rank source basis( {-3}, E3 ) ) assert( rank source basis( {-3,-2}, E) === rank source basis( {-2}, E3 ) ) end -- Local Variables: -- compile-command: "make -C $M2BUILDDIR/Macaulay2/packages/Macaulay2Doc/test Ext.out" -- End:
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