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Mirrors > Home > ILE Home > Th. List > dif0 | Unicode version |
Description: The difference between a class and the empty set. Part of Exercise 4.4 of [Stoll] p. 16. (Contributed by NM, 17-Aug-2004.) |
Ref | Expression |
---|---|
dif0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difid 3431 | . . 3 | |
2 | 1 | difeq2i 3191 | . 2 |
3 | difdif 3201 | . 2 | |
4 | 2, 3 | eqtr3i 2162 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1331 cdif 3068 c0 3363 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rab 2425 df-v 2688 df-dif 3073 df-in 3077 df-ss 3084 df-nul 3364 |
This theorem is referenced by: disjdif2 3441 2oconcl 6336 diffifi 6788 undifdc 6812 difinfinf 6986 ismkvnex 7029 0cld 12281 exmid1stab 13195 |
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