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Schubert2
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demo3.m2
-- Here are some examples and tests of our own. compactMatrixForm = false path = prepend("../", path) needsPackage "Schubert2" F = flagBundle ( {4,2}, VariableNames => {,c} ) AF = intersectionRing F schubertCycle'((0,1),F) F_(0,1) integral oo assert( oo == 1 ) F_(4,5) assert( oo == 1 ) t = {1, c_1, c_2, c_1^2-c_2, c_1*c_2, c_2^2, c_1^3-2*c_1*c_2, c_1^2*c_2-c_2^2, c_1*c_2^2, c_2^3, c_1^4-3*c_1^2*c_2+c_2^2, c_1^3*c_2-2*c_1*c_2^2, c_1^2*c_2^2-c_2^3, c_1*c_2^3, c_2^4} b = reverse flatten for i from 0 to 5 list for j from i+1 to 5 list F_(i,j) assert( b == t ) d = flatten for i from 0 to 4 list for j from 0 to i list F_{i,j} assert( d == t )