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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 8031 | . . . 4 ⊢ 1 ∈ ℂ | |
| 3 | 2 | a1i 9 | . . 3 ⊢ (𝜑 → 1 ∈ ℂ) |
| 4 | muls1d.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 5 | 1, 3, 4 | subdird 8500 | . 2 ⊢ (𝜑 → ((𝐴 − 1) · 𝐵) = ((𝐴 · 𝐵) − (1 · 𝐵))) |
| 6 | 4 | mulid2d 8104 | . . 3 ⊢ (𝜑 → (1 · 𝐵) = 𝐵) |
| 7 | 6 | oveq2d 5970 | . 2 ⊢ (𝜑 → ((𝐴 · 𝐵) − (1 · 𝐵)) = ((𝐴 · 𝐵) − 𝐵)) |
| 8 | 5, 7 | eqtr2d 2240 | 1 ⊢ (𝜑 → ((𝐴 · 𝐵) − 𝐵) = ((𝐴 − 1) · 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1373 ∈ wcel 2177 (class class class)co 5954 ℂcc 7936 1c1 7939 · cmul 7943 − cmin 8256 |
| 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 615 ax-in2 616 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-14 2180 ax-ext 2188 ax-sep 4167 ax-pow 4223 ax-pr 4258 ax-setind 4590 ax-resscn 8030 ax-1cn 8031 ax-icn 8033 ax-addcl 8034 ax-addrcl 8035 ax-mulcl 8036 ax-addcom 8038 ax-mulcom 8039 ax-addass 8040 ax-mulass 8041 ax-distr 8042 ax-i2m1 8043 ax-1rid 8045 ax-0id 8046 ax-rnegex 8047 ax-cnre 8049 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-ral 2490 df-rex 2491 df-reu 2492 df-rab 2494 df-v 2775 df-sbc 3001 df-dif 3170 df-un 3172 df-in 3174 df-ss 3181 df-pw 3620 df-sn 3641 df-pr 3642 df-op 3644 df-uni 3854 df-br 4049 df-opab 4111 df-id 4345 df-xp 4686 df-rel 4687 df-cnv 4688 df-co 4689 df-dm 4690 df-iota 5238 df-fun 5279 df-fv 5285 df-riota 5909 df-ov 5957 df-oprab 5958 df-mpo 5959 df-sub 8258 |
| This theorem is referenced by: subhalfhalf 9285 maxabslemlub 11568 gausslemma2dlem1a 15585 |
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