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| Description: A class of ordered pairs is a function when there is at most one second member for each pair. |
| Ref | Expression |
|---|---|
| funopab |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hbopab1 2813 |
. . . 4
| |
| 2 | hbopab2 2814 |
. . . 4
| |
| 3 | 1, 2 | dffunmof 3530 |
. . 3
|
| 4 | relopab 3266 |
. . 3
| |
| 5 | 3, 4 | mpbiran 728 |
. 2
|
| 6 | df-br 2620 |
. . . . 5
| |
| 7 | opabid 2810 |
. . . . 5
| |
| 8 | 6, 7 | bitr 173 |
. . . 4
|
| 9 | 8 | mobii 1405 |
. . 3
|
| 10 | 9 | albii 999 |
. 2
|
| 11 | 5, 10 | bitr 173 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: funopabeq 3549 isarep2 3578 opabex 3609 opabex2g 3611 zfrep6 3614 fnopabg 3615 fvopab3ig 3778 tz7.44lem1 3927 funoprabg 4010 ajfuni 8520 funadj 9813 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-9 965 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-br 2620 df-opab 2667 df-id 2835 df-xp 3184 df-rel 3185 df-cnv 3186 df-co 3187 df-fun 3192 |