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Mirrors > Home > MPE Home > Th. List > s1fv | Structured version Visualization version GIF version |
Description: Sole symbol of a singleton word. (Contributed by Stefan O'Rear, 15-Aug-2015.) (Revised by Mario Carneiro, 26-Feb-2016.) |
Ref | Expression |
---|---|
s1fv | ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | s1val 13954 | . . 3 ⊢ (𝐴 ∈ 𝐵 → 〈“𝐴”〉 = {〈0, 𝐴〉}) | |
2 | 1 | fveq1d 6674 | . 2 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = ({〈0, 𝐴〉}‘0)) |
3 | 0nn0 11915 | . . 3 ⊢ 0 ∈ ℕ0 | |
4 | fvsng 6944 | . . 3 ⊢ ((0 ∈ ℕ0 ∧ 𝐴 ∈ 𝐵) → ({〈0, 𝐴〉}‘0) = 𝐴) | |
5 | 3, 4 | mpan 688 | . 2 ⊢ (𝐴 ∈ 𝐵 → ({〈0, 𝐴〉}‘0) = 𝐴) |
6 | 2, 5 | eqtrd 2858 | 1 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 {csn 4569 〈cop 4575 ‘cfv 6357 0cc0 10539 ℕ0cn0 11900 〈“cs1 13951 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-mulcl 10601 ax-i2m1 10607 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-iota 6316 df-fun 6359 df-fv 6365 df-n0 11901 df-s1 13952 |
This theorem is referenced by: lsws1 13967 eqs1 13968 wrdl1s1 13970 ccats1val2 13985 ccat1st1st 13986 ccat2s1p1 13987 ccat2s1p2 13988 ccat2s1p1OLD 13989 ccat2s1p2OLD 13990 cats1un 14085 revs1 14129 cats1fvn 14222 s2fv0 14251 efgsval2 18861 efgs1 18863 efgsp1 18865 efgsfo 18867 pgpfaclem1 19205 loopclwwlkn1b 27822 clwwlkn1loopb 27823 clwwlknon1 27878 0wlkons1 27902 1wlkdlem4 27921 wlk2v2elem2 27937 cycpmco2lem2 30771 signstf0 31840 signsvtn0 31842 signstfvneq0 31844 |
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