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| Mirrors > Home > ILE Home > Th. List > fof | GIF version | ||
| Description: An onto mapping is a mapping. (Contributed by NM, 3-Aug-1994.) |
| Ref | Expression |
|---|---|
| fof | ⊢ (𝐹:𝐴–onto→𝐵 → 𝐹:𝐴⟶𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqimss 3302 | . . 3 ⊢ (ran 𝐹 = 𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 2 | 1 | anim2i 342 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐵) → (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) |
| 3 | df-fo 5383 | . 2 ⊢ (𝐹:𝐴–onto→𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 = 𝐵)) | |
| 4 | df-f 5381 | . 2 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) | |
| 5 | 2, 3, 4 | 3imtr4i 201 | 1 ⊢ (𝐹:𝐴–onto→𝐵 → 𝐹:𝐴⟶𝐵) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 = wceq 1402 ⊆ wss 3220 ran crn 4775 Fn wfn 5372 ⟶wf 5373 –onto→wfo 5375 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 df-f 5381 df-fo 5383 |
| This theorem is used by: fofun 5616 fofn 5617 dffo2 5619 foima 5620 resdif 5661 ffoss 5672 fconstfvm 5933 cocan2 5994 foeqcnvco 5996 focdmex 6344 algrflem 6465 algrflemg 6466 tposf2 6539 mapfoss 6947 mapsn 6972 ssdomg 7065 fopwdom 7136 fidcenumlemrks 7270 fidcenumlemr 7272 ctmlemr 7448 ctm 7449 ctssdclemn0 7450 ctssdccl 7451 ctssdc 7453 enumctlemm 7454 enumct 7455 fodjuomnilemdc 7484 exmidfodomrlemr 7554 exmidfodomrlemrALT 7555 suplocexprlemdisj 8087 suplocexprlemub 8090 wrdsymb 11334 ennnfonelemdc 13292 ennnfonelemg 13296 ennnfonelemp1 13299 ennnfonelemhdmp1 13302 ennnfonelemkh 13305 ennnfonelemhf1o 13306 ennnfonelemex 13307 ennnfonelemhom 13308 ctinfomlemom 13320 ctinf 13323 ctiunctlemudc 13330 ctiunctlemf 13331 omctfn 13336 imasival 13629 imasbas 13630 imasplusg 13631 imasmulr 13632 imasaddfnlemg 13637 imasaddvallemg 13638 imasaddflemg 13639 imasmnd2 13761 imasgrp2 13915 mhmid 13920 mhmmnd 13921 mhmfmhm 13922 ghmgrp 13923 ghmfghm 14132 imasring 14371 znunit 14996 znrrg 14997 dvrecap 15816 gausslemma2dlem1f1o 16191 subctctexmid 17042 pw1nct 17045 |
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