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| Mirrors > Home > ILE Home > Th. List > cnvcnv2 | GIF version | ||
| Description: The double converse of a class equals its restriction to the universe. (Contributed by NM, 8-Oct-2007.) |
| Ref | Expression |
|---|---|
| cnvcnv2 | ⊢ ◡◡𝐴 = (𝐴 ↾ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnvcnv 5214 | . 2 ⊢ ◡◡𝐴 = (𝐴 ∩ (V × V)) | |
| 2 | df-res 4760 | . 2 ⊢ (𝐴 ↾ V) = (𝐴 ∩ (V × V)) | |
| 3 | 1, 2 | eqtr4i 2256 | 1 ⊢ ◡◡𝐴 = (𝐴 ↾ V) |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 Vcvv 2812 ∩ cin 3209 × cxp 4746 ◡ccnv 4747 ↾ cres 4750 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-pr 4321 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ral 2525 df-rex 2526 df-v 2814 df-un 3214 df-in 3216 df-ss 3223 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-br 4109 df-opab 4171 df-xp 4754 df-rel 4755 df-cnv 4756 df-res 4760 |
| This theorem is referenced by: dfrel3 5219 rnresv 5221 rescnvcnv 5224 cocnvcnv1 5272 cocnvcnv2 5273 strslfv2d 13244 |
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