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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 13943 | . . 3 ⊢ (𝐴 ∈ 𝐵 → 〈“𝐴”〉 = {〈0, 𝐴〉}) | |
2 | 1 | fveq1d 6647 | . 2 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = ({〈0, 𝐴〉}‘0)) |
3 | 0nn0 11900 | . . 3 ⊢ 0 ∈ ℕ0 | |
4 | fvsng 6919 | . . 3 ⊢ ((0 ∈ ℕ0 ∧ 𝐴 ∈ 𝐵) → ({〈0, 𝐴〉}‘0) = 𝐴) | |
5 | 3, 4 | mpan 689 | . 2 ⊢ (𝐴 ∈ 𝐵 → ({〈0, 𝐴〉}‘0) = 𝐴) |
6 | 2, 5 | eqtrd 2833 | 1 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 {csn 4525 〈cop 4531 ‘cfv 6324 0cc0 10526 ℕ0cn0 11885 〈“cs1 13940 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-mulcl 10588 ax-i2m1 10594 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-iota 6283 df-fun 6326 df-fv 6332 df-n0 11886 df-s1 13941 |
This theorem is referenced by: lsws1 13956 eqs1 13957 wrdl1s1 13959 ccats1val2 13974 ccat1st1st 13975 ccat2s1p1 13976 ccat2s1p2 13977 ccat2s1p1OLD 13978 ccat2s1p2OLD 13979 cats1un 14074 revs1 14118 cats1fvn 14211 s2fv0 14240 efgsval2 18851 efgs1 18853 efgsp1 18855 efgsfo 18857 pgpfaclem1 19196 loopclwwlkn1b 27827 clwwlkn1loopb 27828 clwwlknon1 27882 0wlkons1 27906 1wlkdlem4 27925 wlk2v2elem2 27941 cycpmco2lem2 30819 signstf0 31948 signsvtn0 31950 signstfvneq0 31952 |
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