Metamath Proof Explorer
Description: Surreal addition of a number and its negative. Theorem 4(iii) of
Conway p. 17. (Contributed by Scott Fenton, 5-Feb-2025)
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Ref |
Expression |
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Hypothesis |
negsidd.1 |
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Assertion |
negsidd |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
negsidd.1 |
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2 |
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negsid |
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3 |
1 2
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syl |
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