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| Description: An onto mapping is a mapping. |
| Ref | Expression |
|---|---|
| fof |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqimss 2665 |
. . 3
| |
| 2 | 1 | anim2i 362 |
. 2
|
| 3 | df-fo 4012 |
. 2
| |
| 4 | df-f 4010 |
. 2
| |
| 5 | 2, 3, 4 | 3imtr4i 236 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: fofun 4618 fofn 4619 dffo2 4621 foima 4622 fornex 4625 resdif 4659 ffoss 4665 fconst5 4824 fconstfv 4825 cbvfo 4861 canth 5112 mapsn 5404 ssdomg 5467 unfilem2 5642 fiint 5650 fodomfi 5656 fodomfib 5657 hartoglem 5692 fodom 5960 fodomb 5962 alephiso 6040 ruclem39 8817 infmap2lem2 8849 grpcl 9324 grprndm 9334 resgrprn 9403 subgres 9426 issubgi 9431 ssga 9455 vafval 9554 smfval 9556 nvgf 9569 vsfval 9586 tx1cn 10223 tx2cn 10224 elfilmap3 10314 rnplrnml0 10402 on1el3 10412 pjf 11288 elunop 11436 unopf1o 11477 cnvunop 11479 pjinvari 11764 ghomfo 13634 ghomcl 13635 ghomgsg 13636 ghomf1olem 13637 bdaydm 14015 surrc2 14390 injsurinj 14487 dmrngrp 14699 rnplrnml3 14768 extopgrp 14980 domval 15070 codval 15071 idval 15072 cmpval 15073 issubcat 15193 hartoglemOLD 15383 exidreslem 16030 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-10 1308 ax-12 1310 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 |
| This theorem depends on definitions: df-bi 164 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-in 2603 df-ss 2605 df-f 4010 df-fo 4012 |