coq - Applying hypotesis to a variable -

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let's i'm in middle of proof , have hypotheses these:

a : nat b : nat c : nat h : somepred b

and definition of somepred says:

definition somepred (p:nat) (q:nat) : prop := forall (x : nat), p(x, p, q).

how apply h c , p(c, a, b)?

the answer is:

specialize h c.

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