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Mirrors > Home > MPE Home > Th. List > fin1a2lem3 | Structured version Visualization version GIF version |
Description: Lemma for fin1a2 9839. (Contributed by Stefan O'Rear, 7-Nov-2014.) |
Ref | Expression |
---|---|
fin1a2lem.b | ⊢ 𝐸 = (𝑥 ∈ ω ↦ (2o ·o 𝑥)) |
Ref | Expression |
---|---|
fin1a2lem3 | ⊢ (𝐴 ∈ ω → (𝐸‘𝐴) = (2o ·o 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq2 7166 | . 2 ⊢ (𝑎 = 𝐴 → (2o ·o 𝑎) = (2o ·o 𝐴)) | |
2 | fin1a2lem.b | . . 3 ⊢ 𝐸 = (𝑥 ∈ ω ↦ (2o ·o 𝑥)) | |
3 | oveq2 7166 | . . . 4 ⊢ (𝑥 = 𝑎 → (2o ·o 𝑥) = (2o ·o 𝑎)) | |
4 | 3 | cbvmptv 5171 | . . 3 ⊢ (𝑥 ∈ ω ↦ (2o ·o 𝑥)) = (𝑎 ∈ ω ↦ (2o ·o 𝑎)) |
5 | 2, 4 | eqtri 2846 | . 2 ⊢ 𝐸 = (𝑎 ∈ ω ↦ (2o ·o 𝑎)) |
6 | ovex 7191 | . 2 ⊢ (2o ·o 𝐴) ∈ V | |
7 | 1, 5, 6 | fvmpt 6770 | 1 ⊢ (𝐴 ∈ ω → (𝐸‘𝐴) = (2o ·o 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ↦ cmpt 5148 ‘cfv 6357 (class class class)co 7158 ωcom 7582 2oc2o 8098 ·o comu 8102 |
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 |
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-mpt 5149 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-ov 7161 |
This theorem is referenced by: fin1a2lem4 9827 fin1a2lem5 9828 fin1a2lem6 9829 |
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