Metamath Proof Explorer
Description: Surreal addition is associative. Part of theorem 3 of Conway p. 17.
(Contributed by Scott Fenton, 22-Jan-2025)
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Ref |
Expression |
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Hypotheses |
addsassd.1 |
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addsassd.2 |
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addsassd.3 |
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Assertion |
addsassd |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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addsassd.1 |
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2 |
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addsassd.2 |
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3 |
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addsassd.3 |
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4 |
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addsass |
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5 |
1 2 3 4
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syl3anc |
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