| User Sandbox |
< Previous
Next >
Related theorems GIF version |
| Description: The domain of a category is a relation. |
| Ref | Expression |
|---|---|
| reldcat | ⊢ Rel dom Cat |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | strcat 10775 | . . . 4 ⊢ Cat ⊆ ((V × V) × (V × V)) | |
| 2 | dmss 3367 | . . . 4 ⊢ (Cat ⊆ ((V × V) × (V × V)) → dom Cat ⊆ dom ((V × V) × (V × V))) | |
| 3 | 1, 2 | ax-mp 7 | . . 3 ⊢ dom Cat ⊆ dom ((V × V) × (V × V)) |
| 4 | dmxpid 3390 | . . 3 ⊢ dom ((V × V) × (V × V)) = (V × V) | |
| 5 | 3, 4 | sseqtri 2144 | . 2 ⊢ dom Cat ⊆ (V × V) |
| 6 | df-rel 3242 | . 2 ⊢ (Rel dom Cat ↔ dom Cat ⊆ (V × V)) | |
| 7 | 5, 6 | mpbir 197 | 1 ⊢ Rel dom Cat |
| Colors of variables: wff set class |
| Syntax hints: Vcvv 1858 ⊆ wss 2098 × cxp 3225 dom cdm 3227 Rel wrel 3232 Catccat 10767 |
| This theorem is referenced by: catded 10779 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1003 ax-gen 1004 ax-8 1005 ax-9 1006 ax-10 1007 ax-11 1008 ax-12 1009 ax-13 1010 ax-14 1011 ax-17 1012 ax-4 1014 ax-5o 1016 ax-6o 1019 ax-9o 1164 ax-10o 1182 ax-16 1252 ax-11o 1260 ax-ext 1504 ax-sep 2758 ax-pow 2798 ax-pr 2835 |
| This theorem depends on definitions: df-bi 154 df-or 231 df-an 232 df-ex 1022 df-sb 1214 df-eu 1424 df-mo 1425 df-clab 1510 df-cleq 1515 df-clel 1518 df-ne 1634 df-ral 1696 df-v 1859 df-dif 2100 df-un 2101 df-in 2102 df-ss 2104 df-nul 2332 df-pw 2454 df-sn 2464 df-pr 2465 df-op 2468 df-br 2675 df-opab 2722 df-xp 3241 df-rel 3242 df-dm 3245 df-cat 10768 |