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| Mirrors > Home > ILE Home > Th. List > 2times | GIF version | ||
| Description: Two times a number. (Contributed by NM, 10-Oct-2004.) (Revised by Mario Carneiro, 27-May-2016.) (Proof shortened by AV, 26-Feb-2020.) |
| Ref | Expression |
|---|---|
| 2times | ⊢ (𝐴 ∈ ℂ → (2 · 𝐴) = (𝐴 + 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-2 9115 | . . 3 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq1i 5967 | . 2 ⊢ (2 · 𝐴) = ((1 + 1) · 𝐴) |
| 3 | 1p1times 8226 | . 2 ⊢ (𝐴 ∈ ℂ → ((1 + 1) · 𝐴) = (𝐴 + 𝐴)) | |
| 4 | 2, 3 | eqtrid 2251 | 1 ⊢ (𝐴 ∈ ℂ → (2 · 𝐴) = (𝐴 + 𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1373 ∈ wcel 2177 (class class class)co 5957 ℂcc 7943 1c1 7946 + caddc 7948 · cmul 7950 2c2 9107 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2188 ax-resscn 8037 ax-1cn 8038 ax-icn 8040 ax-addcl 8041 ax-mulcl 8043 ax-mulcom 8046 ax-mulass 8048 ax-distr 8049 ax-1rid 8052 ax-cnre 8056 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-un 3174 df-in 3176 df-ss 3183 df-sn 3644 df-pr 3645 df-op 3647 df-uni 3857 df-br 4052 df-iota 5241 df-fv 5288 df-ov 5960 df-2 9115 |
| This theorem is referenced by: times2 9185 2timesi 9186 2txmxeqx 9188 2halves 9286 halfaddsub 9291 avglt2 9297 2timesd 9300 expubnd 10763 subsq2 10814 sinmul 12130 sin2t 12135 cos2t 12136 pythagtriplem4 12666 pythagtriplem14 12675 pythagtriplem16 12677 |
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