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Mirrors > Home > NFE Home > Th. List > fo00 | GIF version |
Description: Onto mapping of the empty set. (Contributed by set.mm contributors, 22-Mar-2006.) |
Ref | Expression |
---|---|
fo00 | ⊢ (F:∅–onto→A ↔ (F = ∅ ∧ A = ∅)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fofn 5272 | . . . . . 6 ⊢ (F:∅–onto→A → F Fn ∅) | |
2 | fn0 5203 | . . . . . . 7 ⊢ (F Fn ∅ ↔ F = ∅) | |
3 | f10 5317 | . . . . . . . 8 ⊢ ∅:∅–1-1→A | |
4 | f1eq1 5254 | . . . . . . . 8 ⊢ (F = ∅ → (F:∅–1-1→A ↔ ∅:∅–1-1→A)) | |
5 | 3, 4 | mpbiri 224 | . . . . . . 7 ⊢ (F = ∅ → F:∅–1-1→A) |
6 | 2, 5 | sylbi 187 | . . . . . 6 ⊢ (F Fn ∅ → F:∅–1-1→A) |
7 | 1, 6 | syl 15 | . . . . 5 ⊢ (F:∅–onto→A → F:∅–1-1→A) |
8 | 7 | ancri 535 | . . . 4 ⊢ (F:∅–onto→A → (F:∅–1-1→A ∧ F:∅–onto→A)) |
9 | df-f1o 4795 | . . . 4 ⊢ (F:∅–1-1-onto→A ↔ (F:∅–1-1→A ∧ F:∅–onto→A)) | |
10 | 8, 9 | sylibr 203 | . . 3 ⊢ (F:∅–onto→A → F:∅–1-1-onto→A) |
11 | f1ofo 5294 | . . 3 ⊢ (F:∅–1-1-onto→A → F:∅–onto→A) | |
12 | 10, 11 | impbii 180 | . 2 ⊢ (F:∅–onto→A ↔ F:∅–1-1-onto→A) |
13 | f1o00 5318 | . 2 ⊢ (F:∅–1-1-onto→A ↔ (F = ∅ ∧ A = ∅)) | |
14 | 12, 13 | bitri 240 | 1 ⊢ (F:∅–onto→A ↔ (F = ∅ ∧ A = ∅)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 176 ∧ wa 358 = wceq 1642 ∅c0 3551 Fn wfn 4777 –1-1→wf1 4779 –onto→wfo 4780 –1-1-onto→wf1o 4781 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-13 1712 ax-14 1714 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 ax-nin 4079 ax-xp 4080 ax-cnv 4081 ax-1c 4082 ax-sset 4083 ax-si 4084 ax-ins2 4085 ax-ins3 4086 ax-typlower 4087 ax-sn 4088 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-3or 935 df-3an 936 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-eu 2208 df-mo 2209 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2479 df-ne 2519 df-ral 2620 df-rex 2621 df-reu 2622 df-rmo 2623 df-rab 2624 df-v 2862 df-sbc 3048 df-nin 3212 df-compl 3213 df-in 3214 df-un 3215 df-dif 3216 df-symdif 3217 df-ss 3260 df-pss 3262 df-nul 3552 df-if 3664 df-pw 3725 df-sn 3742 df-pr 3743 df-uni 3893 df-int 3928 df-opk 4059 df-1c 4137 df-pw1 4138 df-uni1 4139 df-xpk 4186 df-cnvk 4187 df-ins2k 4188 df-ins3k 4189 df-imak 4190 df-cok 4191 df-p6 4192 df-sik 4193 df-ssetk 4194 df-imagek 4195 df-idk 4196 df-iota 4340 df-0c 4378 df-addc 4379 df-nnc 4380 df-fin 4381 df-lefin 4441 df-ltfin 4442 df-ncfin 4443 df-tfin 4444 df-evenfin 4445 df-oddfin 4446 df-sfin 4447 df-spfin 4448 df-phi 4566 df-op 4567 df-proj1 4568 df-proj2 4569 df-opab 4624 df-br 4641 df-co 4727 df-ima 4728 df-cnv 4786 df-rn 4787 df-dm 4788 df-fun 4790 df-fn 4791 df-f 4792 df-f1 4793 df-fo 4794 df-f1o 4795 |
This theorem is referenced by: (None) |
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