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Definition df-zs 28383
Description: Define the surreal integers. Compare dfz2 12658. (Contributed by Scott Fenton, 17-May-2025.)
Assertion
Ref Expression
df-zs s = ( -s “ (ℕs × ℕs))

Detailed syntax breakdown of Definition df-zs
StepHypRef Expression
1 czs 28382 . 2 class s
2 csubs 28070 . . 3 class -s
3 cnns 28337 . . . 4 class s
43, 3cxp 5698 . . 3 class (ℕs × ℕs)
52, 4cima 5703 . 2 class ( -s “ (ℕs × ℕs))
61, 5wceq 1537 1 wff s = ( -s “ (ℕs × ℕs))
Colors of variables: wff setvar class
This definition is referenced by:  zsex  28384  zssno  28385  elzs  28388
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