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Mirrors > Home > NFE Home > Th. List > opfv2nd | GIF version |
Description: The value of the 2nd function on an ordered pair. (Contributed by SF, 23-Feb-2015.) |
Ref | Expression |
---|---|
opfv1st.1 | ⊢ A ∈ V |
opfv1st.2 | ⊢ B ∈ V |
Ref | Expression |
---|---|
opfv2nd | ⊢ (2nd ‘〈A, B〉) = B |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2353 | . . 3 ⊢ B = B | |
2 | opfv1st.1 | . . . 4 ⊢ A ∈ V | |
3 | opfv1st.2 | . . . 4 ⊢ B ∈ V | |
4 | 2, 3 | opbr2nd 5502 | . . 3 ⊢ (〈A, B〉2nd B ↔ B = B) |
5 | 1, 4 | mpbir 200 | . 2 ⊢ 〈A, B〉2nd B |
6 | 2ndfo 5506 | . . . 4 ⊢ 2nd :V–onto→V | |
7 | fofn 5271 | . . . 4 ⊢ (2nd :V–onto→V → 2nd Fn V) | |
8 | 6, 7 | ax-mp 5 | . . 3 ⊢ 2nd Fn V |
9 | 2, 3 | opex 4588 | . . 3 ⊢ 〈A, B〉 ∈ V |
10 | fnbrfvb 5358 | . . 3 ⊢ ((2nd Fn V ∧ 〈A, B〉 ∈ V) → ((2nd ‘〈A, B〉) = B ↔ 〈A, B〉2nd B)) | |
11 | 8, 9, 10 | mp2an 653 | . 2 ⊢ ((2nd ‘〈A, B〉) = B ↔ 〈A, B〉2nd B) |
12 | 5, 11 | mpbir 200 | 1 ⊢ (2nd ‘〈A, B〉) = B |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 176 = wceq 1642 ∈ wcel 1710 Vcvv 2859 〈cop 4561 class class class wbr 4639 Fn wfn 4776 –onto→wfo 4779 ‘cfv 4781 2nd c2nd 4783 |
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 4078 ax-xp 4079 ax-cnv 4080 ax-1c 4081 ax-sset 4082 ax-si 4083 ax-ins2 4084 ax-ins3 4085 ax-typlower 4086 ax-sn 4087 |
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 2478 df-ne 2518 df-ral 2619 df-rex 2620 df-reu 2621 df-rmo 2622 df-rab 2623 df-v 2861 df-sbc 3047 df-nin 3211 df-compl 3212 df-in 3213 df-un 3214 df-dif 3215 df-symdif 3216 df-ss 3259 df-pss 3261 df-nul 3551 df-if 3663 df-pw 3724 df-sn 3741 df-pr 3742 df-uni 3892 df-int 3927 df-opk 4058 df-1c 4136 df-pw1 4137 df-uni1 4138 df-xpk 4185 df-cnvk 4186 df-ins2k 4187 df-ins3k 4188 df-imak 4189 df-cok 4190 df-p6 4191 df-sik 4192 df-ssetk 4193 df-imagek 4194 df-idk 4195 df-iota 4339 df-0c 4377 df-addc 4378 df-nnc 4379 df-fin 4380 df-lefin 4440 df-ltfin 4441 df-ncfin 4442 df-tfin 4443 df-evenfin 4444 df-oddfin 4445 df-sfin 4446 df-spfin 4447 df-phi 4565 df-op 4566 df-proj1 4567 df-proj2 4568 df-opab 4623 df-br 4640 df-co 4726 df-ima 4727 df-id 4767 df-cnv 4785 df-rn 4786 df-dm 4787 df-fun 4789 df-fn 4790 df-f 4791 df-fo 4793 df-fv 4795 df-2nd 4797 |
This theorem is referenced by: 1st2nd2 5516 op2ndd 5523 |
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