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Mirrors > Home > ILE Home > Th. List > dif0 | GIF 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 | ⊢ (𝐴 ∖ ∅) = 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difid 3472 | . . 3 ⊢ (𝐴 ∖ 𝐴) = ∅ | |
2 | 1 | difeq2i 3232 | . 2 ⊢ (𝐴 ∖ (𝐴 ∖ 𝐴)) = (𝐴 ∖ ∅) |
3 | difdif 3242 | . 2 ⊢ (𝐴 ∖ (𝐴 ∖ 𝐴)) = 𝐴 | |
4 | 2, 3 | eqtr3i 2187 | 1 ⊢ (𝐴 ∖ ∅) = 𝐴 |
Colors of variables: wff set class |
Syntax hints: = wceq 1342 ∖ cdif 3108 ∅c0 3404 |
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 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rab 2451 df-v 2723 df-dif 3113 df-in 3117 df-ss 3124 df-nul 3405 |
This theorem is referenced by: disjdif2 3482 2oconcl 6398 diffifi 6851 undifdc 6880 difinfinf 7057 ismkvnex 7110 0cld 12659 exmid1stab 13721 |
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