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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 9372 | . . 3 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq1i 6098 | . 2 ⊢ (2 · 𝐴) = ((1 + 1) · 𝐴) |
| 3 | 1p1times 8467 | . 2 ⊢ (𝐴 ∈ ℂ → ((1 + 1) · 𝐴) = (𝐴 + 𝐴)) | |
| 4 | 2, 3 | eqtrid 2283 | 1 ⊢ (𝐴 ∈ ℂ → (2 · 𝐴) = (𝐴 + 𝐴)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ∈ wcel 2209 (class class class)co 6088 ℂcc 8183 1c1 8186 + caddc 8188 · cmul 8190 2c2 9364 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-resscn 8277 ax-1cn 8278 ax-icn 8280 ax-addcl 8281 ax-mulcl 8283 ax-mulcom 8286 ax-mulass 8288 ax-distr 8289 ax-1rid 8292 ax-cnre 8296 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-iota 5340 df-fv 5388 df-ov 6091 df-2 9372 |
| This theorem is used by: times2 9442 2timesi 9443 2txmxeqx 9445 2halves 9545 halfaddsub 9550 avglt2 9556 2timesd 9559 expubnd 11054 subsq2 11105 sinmul 12536 sin2t 12541 cos2t 12542 pythagtriplem4 13076 pythagtriplem14 13085 pythagtriplem16 13087 pellexlem2 16230 |
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