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| Mirrors > Home > MPE Home > Th. List > ex-2nd | Structured version Visualization version GIF version | ||
| Description: Example for df-2nd 7987. Example by David A. Wheeler. (Contributed by Mario Carneiro, 18-Jun-2015.) |
| Ref | Expression |
|---|---|
| ex-2nd | ⊢ (2nd ‘〈3, 4〉) = 4 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3ex 12347 | . 2 ⊢ 3 ∈ V | |
| 2 | 4re 12349 | . . 3 ⊢ 4 ∈ ℝ | |
| 3 | 2 | elexi 3472 | . 2 ⊢ 4 ∈ V |
| 4 | 1, 3 | op2nd 7995 | 1 ⊢ (2nd ‘〈3, 4〉) = 4 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 〈cop 4590 ‘cfv 6533 2nd c2nd 7985 ℝcr 11123 3c3 12320 4c4 12321 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 ax-un 7736 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-i2m1 11192 ax-1ne0 11193 ax-rrecex 11196 ax-cnre 11197 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-iota 6489 df-fun 6535 df-fv 6541 df-ov 7416 df-2nd 7987 df-2 12327 df-3 12328 df-4 12329 |
| This theorem is used by: (None) |
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