Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > f1ocnv | GIF version |
Description: The converse of a one-to-one onto function is also one-to-one onto. (Contributed by NM, 11-Feb-1997.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Ref | Expression |
---|---|
f1ocnv | ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fnrel 5221 | . . . . 5 ⊢ (𝐹 Fn 𝐴 → Rel 𝐹) | |
2 | dfrel2 4989 | . . . . . 6 ⊢ (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹) | |
3 | fneq1 5211 | . . . . . . 7 ⊢ (◡◡𝐹 = 𝐹 → (◡◡𝐹 Fn 𝐴 ↔ 𝐹 Fn 𝐴)) | |
4 | 3 | biimprd 157 | . . . . . 6 ⊢ (◡◡𝐹 = 𝐹 → (𝐹 Fn 𝐴 → ◡◡𝐹 Fn 𝐴)) |
5 | 2, 4 | sylbi 120 | . . . . 5 ⊢ (Rel 𝐹 → (𝐹 Fn 𝐴 → ◡◡𝐹 Fn 𝐴)) |
6 | 1, 5 | mpcom 36 | . . . 4 ⊢ (𝐹 Fn 𝐴 → ◡◡𝐹 Fn 𝐴) |
7 | 6 | anim2i 339 | . . 3 ⊢ ((◡𝐹 Fn 𝐵 ∧ 𝐹 Fn 𝐴) → (◡𝐹 Fn 𝐵 ∧ ◡◡𝐹 Fn 𝐴)) |
8 | 7 | ancoms 266 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ ◡𝐹 Fn 𝐵) → (◡𝐹 Fn 𝐵 ∧ ◡◡𝐹 Fn 𝐴)) |
9 | dff1o4 5375 | . 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹 Fn 𝐴 ∧ ◡𝐹 Fn 𝐵)) | |
10 | dff1o4 5375 | . 2 ⊢ (◡𝐹:𝐵–1-1-onto→𝐴 ↔ (◡𝐹 Fn 𝐵 ∧ ◡◡𝐹 Fn 𝐴)) | |
11 | 8, 9, 10 | 3imtr4i 200 | 1 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1331 ◡ccnv 4538 Rel wrel 4544 Fn wfn 5118 –1-1-onto→wf1o 5122 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 |
This theorem is referenced by: f1ocnvb 5381 f1orescnv 5383 f1imacnv 5384 f1cnv 5391 f1ococnv1 5396 f1oresrab 5585 f1ocnvfv2 5679 f1ocnvdm 5682 f1ocnvfvrneq 5683 fcof1o 5690 isocnv 5712 f1ofveu 5762 mapsnf1o3 6591 ener 6673 en0 6689 en1 6693 mapen 6740 ssenen 6745 preimaf1ofi 6839 ordiso2 6920 caseinl 6976 caseinr 6977 ctssdccl 6996 ctssdclemr 6997 enomnilem 7010 fnn0nninf 10210 0tonninf 10212 1tonninf 10213 iseqf1olemkle 10257 iseqf1olemklt 10258 iseqf1olemqcl 10259 iseqf1olemnab 10261 iseqf1olemmo 10265 iseqf1olemqk 10267 seq3f1olemqsumkj 10271 seq3f1olemqsumk 10272 seq3f1olemstep 10274 hashfz1 10529 hashfacen 10579 seq3coll 10585 cnrecnv 10682 nnf1o 11145 summodclem3 11149 summodclem2a 11150 prodmodclem3 11344 prodmodclem2a 11345 sqpweven 11853 2sqpwodd 11854 phimullem 11901 xpnnen 11907 ennnfonelemjn 11915 ennnfonelemp1 11919 ennnfonelemhdmp1 11922 ennnfonelemss 11923 ennnfonelemkh 11925 ennnfonelemhf1o 11926 ennnfonelemex 11927 ennnfonelemf1 11931 ennnfonelemnn0 11935 ennnfonelemim 11937 ctinfomlemom 11940 ctiunctlemfo 11952 txhmeo 12488 exmidsbthrlem 13217 isomninnlem 13225 |
Copyright terms: Public domain | W3C validator |