Theorem divs1d

Description: A surreal divided by one is itself. Deduction version. (Contributed by Scott Fenton, 27-Feb-2026)

	Ref	Expression
Hypothesis	divs1d.1	$$⊢\phi \to A\in \mathrm{No}$$
Assertion	divs1d	$$⊢\phi \to A{/}_{\mathrm{su}}{1}_s=A$$

Proof

Step	Hyp	Ref	Expression
1		divs1d.1	$$⊢\phi \to A\in \mathrm{No}$$
2		divs1	$$⊢A\in \mathrm{No}\to A{/}_{\mathrm{su}}{1}_s=A$$
3	1 2	syl	$$⊢\phi \to A{/}_{\mathrm{su}}{1}_s=A$$