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Definition df-1s 27326
Description: Define surreal one. This is the simplest number greater than surreal zero. Definition from [Conway] p. 18. (Contributed by Scott Fenton, 7-Aug-2024.)
Assertion
Ref Expression
df-1s 1s = ({ 0s } |s ∅)

Detailed syntax breakdown of Definition df-1s
StepHypRef Expression
1 c1s 27324 . 2 class 1s
2 c0s 27323 . . . 4 class 0s
32csn 4629 . . 3 class { 0s }
4 c0 4323 . . 3 class
5 cscut 27284 . . 3 class |s
63, 4, 5co 7409 . 2 class ({ 0s } |s ∅)
71, 6wceq 1542 1 wff 1s = ({ 0s } |s ∅)
Colors of variables: wff setvar class
This definition is referenced by:  1sno  27328  0slt1s  27330  bday1s  27332
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