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Mirrors > Home > MPE Home > Th. List > subcl | Structured version Visualization version Unicode version |
Description: Closure law for subtraction. (Contributed by NM, 10-May-1999.) (Revised by Mario Carneiro, 21-Dec-2013.) |
Ref | Expression |
---|---|
subcl |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | subval 10272 |
. 2
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2 | negeu 10271 |
. . . 4
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3 | 2 | ancoms 469 |
. . 3
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4 | riotacl 6625 |
. . 3
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5 | 3, 4 | syl 17 |
. 2
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6 | 1, 5 | eqeltrd 2701 |
1
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