Following the idea of Exercise 10, let X be a simplicial complex, and let the group C

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Following the idea of Exercise 10, let X be a simplicial complex, and let the group C(n)(X) of n-cochains be the same as the group Cn(X). 

a. Define δ(n) : C(n)(X) → C(n+1)(X) in a way analogous to the way we defined ∂n: Cn(X) → Cn-1(X). 

b. Show that ∂2 = 0, that is, that ,∂(n+1)n(c)) = 0 for each c ∈ C(n)(X).

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