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| Mirrors > Home > MPE Home > Th. List > xmul01 | Structured version Visualization version GIF version | ||
| Description: Extended real version of mul01 11324. (Contributed by Mario Carneiro, 20-Aug-2015.) |
| Ref | Expression |
|---|---|
| xmul01 | ⊢ (𝐴 ∈ ℝ* → (𝐴 ·e 0) = 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0xr 11191 | . . 3 ⊢ 0 ∈ ℝ* | |
| 2 | xmulval 13152 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ∈ ℝ*) → (𝐴 ·e 0) = if((𝐴 = 0 ∨ 0 = 0), 0, if((((0 < 0 ∧ 𝐴 = +∞) ∨ (0 < 0 ∧ 𝐴 = -∞)) ∨ ((0 < 𝐴 ∧ 0 = +∞) ∨ (𝐴 < 0 ∧ 0 = -∞))), +∞, if((((0 < 0 ∧ 𝐴 = -∞) ∨ (0 < 0 ∧ 𝐴 = +∞)) ∨ ((0 < 𝐴 ∧ 0 = -∞) ∨ (𝐴 < 0 ∧ 0 = +∞))), -∞, (𝐴 · 0))))) | |
| 3 | 1, 2 | mpan2 692 | . 2 ⊢ (𝐴 ∈ ℝ* → (𝐴 ·e 0) = if((𝐴 = 0 ∨ 0 = 0), 0, if((((0 < 0 ∧ 𝐴 = +∞) ∨ (0 < 0 ∧ 𝐴 = -∞)) ∨ ((0 < 𝐴 ∧ 0 = +∞) ∨ (𝐴 < 0 ∧ 0 = -∞))), +∞, if((((0 < 0 ∧ 𝐴 = -∞) ∨ (0 < 0 ∧ 𝐴 = +∞)) ∨ ((0 < 𝐴 ∧ 0 = -∞) ∨ (𝐴 < 0 ∧ 0 = +∞))), -∞, (𝐴 · 0))))) |
| 4 | eqid 2737 | . . . 4 ⊢ 0 = 0 | |
| 5 | 4 | olci 867 | . . 3 ⊢ (𝐴 = 0 ∨ 0 = 0) |
| 6 | 5 | iftruei 4488 | . 2 ⊢ if((𝐴 = 0 ∨ 0 = 0), 0, if((((0 < 0 ∧ 𝐴 = +∞) ∨ (0 < 0 ∧ 𝐴 = -∞)) ∨ ((0 < 𝐴 ∧ 0 = +∞) ∨ (𝐴 < 0 ∧ 0 = -∞))), +∞, if((((0 < 0 ∧ 𝐴 = -∞) ∨ (0 < 0 ∧ 𝐴 = +∞)) ∨ ((0 < 𝐴 ∧ 0 = -∞) ∨ (𝐴 < 0 ∧ 0 = +∞))), -∞, (𝐴 · 0)))) = 0 |
| 7 | 3, 6 | eqtrdi 2788 | 1 ⊢ (𝐴 ∈ ℝ* → (𝐴 ·e 0) = 0) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∨ wo 848 = wceq 1542 ∈ wcel 2114 ifcif 4481 class class class wbr 5100 (class class class)co 7368 0cc0 11038 · cmul 11043 +∞cpnf 11175 -∞cmnf 11176 ℝ*cxr 11177 < clt 11178 ·e cxmu 13037 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-i2m1 11106 ax-rnegex 11109 ax-cnre 11111 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-sbc 3743 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-iota 6456 df-fun 6502 df-fv 6508 df-ov 7371 df-oprab 7372 df-mpo 7373 df-pnf 11180 df-mnf 11181 df-xr 11182 df-xmul 13040 |
| This theorem is referenced by: xmul02 13195 xmulge0 13211 xmulass 13214 xlemul1a 13215 xadddilem 13221 xadddi2 13224 psmetge0 24268 xmetge0 24300 nmoix 24685 hashxpe 32897 xrge0mulc1cn 34118 esumcst 34240 |
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