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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 13951 | . . 3 ⊢ (𝐴 ∈ 𝐵 → 〈“𝐴”〉 = {〈0, 𝐴〉}) | |
2 | 1 | fveq1d 6671 | . 2 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = ({〈0, 𝐴〉}‘0)) |
3 | 0nn0 11911 | . . 3 ⊢ 0 ∈ ℕ0 | |
4 | fvsng 6941 | . . 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 2856 | 1 ⊢ (𝐴 ∈ 𝐵 → (〈“𝐴”〉‘0) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2110 {csn 4566 〈cop 4572 ‘cfv 6354 0cc0 10536 ℕ0cn0 11896 〈“cs1 13948 |
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 5202 ax-nul 5209 ax-pr 5329 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-mulcl 10598 ax-i2m1 10604 |
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 4567 df-pr 4569 df-op 4573 df-uni 4838 df-br 5066 df-opab 5128 df-id 5459 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-iota 6313 df-fun 6356 df-fv 6362 df-n0 11897 df-s1 13949 |
This theorem is referenced by: lsws1 13964 eqs1 13965 wrdl1s1 13967 ccats1val2 13982 ccat1st1st 13983 ccat2s1p1 13984 ccat2s1p2 13985 ccat2s1p1OLD 13986 ccat2s1p2OLD 13987 cats1un 14082 revs1 14126 cats1fvn 14219 s2fv0 14248 efgsval2 18858 efgs1 18860 efgsp1 18862 efgsfo 18864 pgpfaclem1 19202 loopclwwlkn1b 27819 clwwlkn1loopb 27820 clwwlknon1 27875 0wlkons1 27899 1wlkdlem4 27918 wlk2v2elem2 27934 cycpmco2lem2 30769 signstf0 31838 signsvtn0 31840 signstfvneq0 31842 |
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