[sage-support] how do I do this exercise that asks me given a bilinear form and a subspace determine the root base of the bilinear form restricted to the subspace

[Cosimo Romito]

sage:
def es(b,W):
    m=dimension(span(A))
    n=W.dimension()
    B=W.basis()
    if transpose(A)<>A:
        print("La matrice deve essere simmetrica")
        return 
    else:
        componenti=[var('x'+str(i)) for i in range(1,m+1)]
        w=(SR^m).linear_combination_of_basis(componenti)
        d=[b(B[i],w) for i in range(0,n)]
        
        return d
       

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