Theorem nmullidd

Description: Identity law for natural multiplication. Deduction form. (Contributed by Scott Fenton, 30-Jul-2026)

	Ref	Expression
Hypothesis	nmul.1	$$⊢\phi \to A\in \mathrm{On}$$
Assertion	nmullidd	Could not format assertion : No typesetting found for |- ( ph -> ( 1o .no A ) = A ) with typecode |-

Proof

Step	Hyp	Ref	Expression
1		nmul.1	$$⊢\phi \to A\in \mathrm{On}$$
2		nmullid	Could not format ( A e. On -> ( 1o .no A ) = A ) : No typesetting found for |- ( A e. On -> ( 1o .no A ) = A ) with typecode |-
3	1 2	syl	Could not format ( ph -> ( 1o .no A ) = A ) : No typesetting found for |- ( ph -> ( 1o .no A ) = A ) with typecode |-