The number of single residue ideals of `k⟦T, X⟧ ⧸ (T^a)` with contact `c` with `T` is `q^(ac

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The number of single residue ideals of `k⟦T, X⟧ ⧸ (T^a)` with contact `c` with `T` is `q^(ac - c)`, where `q = #k`. · Prove2Me