Metamath Proof Explorer
Description: Commutative law for multiplication. (Contributed by metakunt, 25-Apr-2024)
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Ref |
Expression |
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Hypotheses |
mulcomnni.1 |
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mulcomnni.2 |
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Assertion |
mulcomnni |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
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mulcomnni.1 |
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2 |
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mulcomnni.2 |
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3 |
1
|
nncni |
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4 |
2
|
nncni |
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5 |
3 4
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mulcomi |
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