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Related theorems GIF version |
| Description: Equinumerosity is a relation. |
| Ref | Expression |
|---|---|
| relen | ⊢ Rel ≈ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | relopab 3272 | . 2 ⊢ Rel {〈x, y〉∣∃f f:x–1-1-onto→y} | |
| 2 | df-en 4374 | . . 3 ⊢ ≈ = {〈x, y〉∣∃f f:x–1-1-onto→y} | |
| 3 | 2 | releqi 3250 | . 2 ⊢ (Rel ≈ ↔ Rel {〈x, y〉∣∃f f:x–1-1-onto→y}) |
| 4 | 1, 3 | mpbir 190 | 1 ⊢ Rel ≈ |
| Colors of variables: wff set class |
| Syntax hints: ∃wex 982 {copab 2671 Rel wrel 3181 –1-1-onto→wf1o 3187 ≈ cen 4370 |
| This theorem is referenced by: breng 4381 isfi 4388 enssdom 4389 ensymg 4417 entrt 4420 unen 4440 sbthcl 4465 sdomen2 4488 pwen 4509 php3 4521 php3OLD 4522 domfiOLD 4550 unifiOLD 4570 fodomfi 4575 fodomfiOLD 4576 pwfiOLD 4580 card1 4843 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-opab 2672 df-xp 3190 df-rel 3191 df-en 4374 |