Re: [isabelle] reasoning with even and odd numbers

One possibility:

lemma "ev 4"
using evSS[OF evSS[OF ev0]]
by(simp add: numeral_eq_Suc)

Thank you.

Is there a difference between using a proof vs adding it to simp like this?

lemma "ev 4"
by (simp add: numeral_eq_Suc evSS[OF evSS[OF ev0]])


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