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Mirrors > Home > MPE Home > Th. List > incom | Structured version Visualization version Unicode version |
Description: Commutative law for intersection of classes. Exercise 7 of [TakeutiZaring] p. 17. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
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incom |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ancom 456 |
. . 3
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2 | elin 3629 |
. . 3
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3 | elin 3629 |
. . 3
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4 | 1, 2, 3 | 3bitr4i 285 |
. 2
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5 | 4 | eqriv 2459 |
1
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