Definition df-nns 28311

Description: Define the set of positive surreal integers. (Contributed by Scott Fenton, 17-Mar-2025.)

Assertion

Ref	Expression
df-nns	⊢ ℕs = (ℕ0s ∖ { 0s })

Detailed syntax breakdown of Definition df-nns

Step	Hyp	Ref	Expression
1		cnns 28309	. 2 class ℕs
2		cn0s 28308	. . 3 class ℕ0s
3		c0s 27801	. . . 4 class 0s
4	3	csn 4580	. . 3 class { 0s }
5	2, 4	cdif 3898	. 2 class (ℕ0s ∖ { 0s })
6	1, 5	wceq 1541	1 wff ℕs = (ℕ0s ∖ { 0s })

This definition is referenced by:  nnsex  28314  nnssn0s  28317  nnne0s  28333  elnns  28336  1nns  28345