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Mirrors > Home > ILE Home > Th. List > eqcom | Unicode version |
Description: Commutative law for class equality. Theorem 6.5 of [Quine] p. 41. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
eqcom |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bicom 140 |
. . 3
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2 | 1 | albii 1470 |
. 2
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3 | dfcleq 2171 |
. 2
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4 | dfcleq 2171 |
. 2
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5 | 2, 3, 4 | 3bitr4i 212 |
1
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