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| Mirrors > Home > ILE Home > Th. List > mulsubfacd | GIF version | ||
| Description: Multiplication followed by the subtraction of a factor. (Contributed by Alexander van der Vekens, 28-Aug-2018.) |
| Ref | Expression |
|---|---|
| muls1d.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| muls1d.2 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| Ref | Expression |
|---|---|
| mulsubfacd | ⊢ (𝜑 → ((𝐴 · 𝐵) − 𝐵) = ((𝐴 − 1) · 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | muls1d.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
| 2 | ax-1cn 8108 | . . . 4 ⊢ 1 ∈ ℂ | |
| 3 | 2 | a1i 9 | . . 3 ⊢ (𝜑 → 1 ∈ ℂ) |
| 4 | muls1d.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 5 | 1, 3, 4 | subdird 8577 | . 2 ⊢ (𝜑 → ((𝐴 − 1) · 𝐵) = ((𝐴 · 𝐵) − (1 · 𝐵))) |
| 6 | 4 | mulid2d 8181 | . . 3 ⊢ (𝜑 → (1 · 𝐵) = 𝐵) |
| 7 | 6 | oveq2d 6026 | . 2 ⊢ (𝜑 → ((𝐴 · 𝐵) − (1 · 𝐵)) = ((𝐴 · 𝐵) − 𝐵)) |
| 8 | 5, 7 | eqtr2d 2263 | 1 ⊢ (𝜑 → ((𝐴 · 𝐵) − 𝐵) = ((𝐴 − 1) · 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 (class class class)co 6010 ℂcc 8013 1c1 8016 · cmul 8020 − cmin 8333 |
| 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-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4259 ax-pr 4294 ax-setind 4630 ax-resscn 8107 ax-1cn 8108 ax-icn 8110 ax-addcl 8111 ax-addrcl 8112 ax-mulcl 8113 ax-addcom 8115 ax-mulcom 8116 ax-addass 8117 ax-mulass 8118 ax-distr 8119 ax-i2m1 8120 ax-1rid 8122 ax-0id 8123 ax-rnegex 8124 ax-cnre 8126 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-id 4385 df-xp 4726 df-rel 4727 df-cnv 4728 df-co 4729 df-dm 4730 df-iota 5281 df-fun 5323 df-fv 5329 df-riota 5963 df-ov 6013 df-oprab 6014 df-mpo 6015 df-sub 8335 |
| This theorem is referenced by: subhalfhalf 9362 maxabslemlub 11739 gausslemma2dlem1a 15758 |
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