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Mirrors > Home > MPE Home > Th. List > ids1 | Structured version Visualization version GIF version |
Description: Identity function protection for a singleton word. (Contributed by Mario Carneiro, 26-Feb-2016.) |
Ref | Expression |
---|---|
ids1 | ⊢ 〈“𝐴”〉 = 〈“( I ‘𝐴)”〉 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fvex 6677 | . . . . 5 ⊢ ( I ‘𝐴) ∈ V | |
2 | fvi 6734 | . . . . 5 ⊢ (( I ‘𝐴) ∈ V → ( I ‘( I ‘𝐴)) = ( I ‘𝐴)) | |
3 | 1, 2 | ax-mp 5 | . . . 4 ⊢ ( I ‘( I ‘𝐴)) = ( I ‘𝐴) |
4 | 3 | opeq2i 4800 | . . 3 ⊢ 〈0, ( I ‘( I ‘𝐴))〉 = 〈0, ( I ‘𝐴)〉 |
5 | 4 | sneqi 4571 | . 2 ⊢ {〈0, ( I ‘( I ‘𝐴))〉} = {〈0, ( I ‘𝐴)〉} |
6 | df-s1 13944 | . 2 ⊢ 〈“( I ‘𝐴)”〉 = {〈0, ( I ‘( I ‘𝐴))〉} | |
7 | df-s1 13944 | . 2 ⊢ 〈“𝐴”〉 = {〈0, ( I ‘𝐴)〉} | |
8 | 5, 6, 7 | 3eqtr4ri 2855 | 1 ⊢ 〈“𝐴”〉 = 〈“( I ‘𝐴)”〉 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1533 ∈ wcel 2110 Vcvv 3494 {csn 4560 〈cop 4566 I cid 5453 ‘cfv 6349 0cc0 10531 〈“cs1 13943 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pr 5321 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-id 5454 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-iota 6308 df-fun 6351 df-fv 6357 df-s1 13944 |
This theorem is referenced by: s1prc 13952 s1cli 13953 revs1 14121 |
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