Build algebra cohomology [closed]

asked 2018-03-20 15:13:23 -0500

SahDoum gravatar image

I have an algebra and a differential over this algebra. I want to construct cohomology ring and find the annihilators of some elements. How could I do that with sage?

My algebra looks like:

variables =  ', '.join(['u{}'.format(i+1) for i in range(n)] + ['v{}'.format(j+1) for j in range(n)])
F = FreeAlgebra(ZZ, n+n, variables)
gens = F.gens()
u = gens[:n]
v = gens[n:]
print u
print v

I = []

# Koszul
for i in range(5):
    for j in range(i+1, 5):
        I.append(u[i]*u[j] - u[j]*u[i])
# Stanley-Raysner
for i in range(5):
    for j in range(i+1, 5):
        if j - i != 1 and j-i != 4:
            I.append(v[i]*v[j])

A = F.quotient(F * I * F)
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Closed for the following reason duplicate question by tmonteil
close date 2018-03-20 15:33:09.022532