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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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | subval 10272 | . 2 | |
2 | negeu 10271 | . . . 4 | |
3 | 2 | ancoms 469 | . . 3 |
4 | riotacl 6625 | . . 3 | |
5 | 3, 4 | syl 17 | . 2 |
6 | 1, 5 | eqeltrd 2701 | 1 |
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