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| Mirrors > Home > ILE Home > Th. List > xnegid | GIF version | ||
| Description: Extended real version of negid 8573. (Contributed by Mario Carneiro, 20-Aug-2015.) |
| Ref | Expression |
|---|---|
| xnegid | ⊢ (𝐴 ∈ ℝ* → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxr 10178 | . 2 ⊢ (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞)) | |
| 2 | rexneg 10232 | . . . . 5 ⊢ (𝐴 ∈ ℝ → -𝑒𝐴 = -𝐴) | |
| 3 | 2 | oveq2d 6101 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 +𝑒 -𝑒𝐴) = (𝐴 +𝑒 -𝐴)) |
| 4 | renegcl 8587 | . . . . 5 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) | |
| 5 | rexadd 10254 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ -𝐴 ∈ ℝ) → (𝐴 +𝑒 -𝐴) = (𝐴 + -𝐴)) | |
| 6 | 4, 5 | mpdan 425 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 +𝑒 -𝐴) = (𝐴 + -𝐴)) |
| 7 | recn 8312 | . . . . 5 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
| 8 | 7 | negidd 8627 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 + -𝐴) = 0) |
| 9 | 3, 6, 8 | 3eqtrd 2275 | . . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| 10 | id 19 | . . . . 5 ⊢ (𝐴 = +∞ → 𝐴 = +∞) | |
| 11 | xnegeq 10229 | . . . . . 6 ⊢ (𝐴 = +∞ → -𝑒𝐴 = -𝑒+∞) | |
| 12 | xnegpnf 10230 | . . . . . 6 ⊢ -𝑒+∞ = -∞ | |
| 13 | 11, 12 | eqtrdi 2287 | . . . . 5 ⊢ (𝐴 = +∞ → -𝑒𝐴 = -∞) |
| 14 | 10, 13 | oveq12d 6103 | . . . 4 ⊢ (𝐴 = +∞ → (𝐴 +𝑒 -𝑒𝐴) = (+∞ +𝑒 -∞)) |
| 15 | pnfaddmnf 10252 | . . . 4 ⊢ (+∞ +𝑒 -∞) = 0 | |
| 16 | 14, 15 | eqtrdi 2287 | . . 3 ⊢ (𝐴 = +∞ → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| 17 | id 19 | . . . . 5 ⊢ (𝐴 = -∞ → 𝐴 = -∞) | |
| 18 | xnegeq 10229 | . . . . . 6 ⊢ (𝐴 = -∞ → -𝑒𝐴 = -𝑒-∞) | |
| 19 | xnegmnf 10231 | . . . . . 6 ⊢ -𝑒-∞ = +∞ | |
| 20 | 18, 19 | eqtrdi 2287 | . . . . 5 ⊢ (𝐴 = -∞ → -𝑒𝐴 = +∞) |
| 21 | 17, 20 | oveq12d 6103 | . . . 4 ⊢ (𝐴 = -∞ → (𝐴 +𝑒 -𝑒𝐴) = (-∞ +𝑒 +∞)) |
| 22 | mnfaddpnf 10253 | . . . 4 ⊢ (-∞ +𝑒 +∞) = 0 | |
| 23 | 21, 22 | eqtrdi 2287 | . . 3 ⊢ (𝐴 = -∞ → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| 24 | 9, 16, 23 | 3jaoi 1344 | . 2 ⊢ ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| 25 | 1, 24 | sylbi 121 | 1 ⊢ (𝐴 ∈ ℝ* → (𝐴 +𝑒 -𝑒𝐴) = 0) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∨ w3o 1008 = wceq 1402 ∈ wcel 2209 (class class class)co 6085 ℝcr 8178 0cc0 8179 + caddc 8182 +∞cpnf 8357 -∞cmnf 8358 ℝ*cxr 8359 -cneg 8498 -𝑒cxne 10171 +𝑒 cxad 10172 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 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-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-distr 8283 ax-i2m1 8284 ax-0id 8287 ax-rnegex 8288 ax-cnre 8290 |
| This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-iota 5337 df-fun 5379 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-pnf 8362 df-mnf 8363 df-xr 8364 df-sub 8499 df-neg 8500 df-xneg 10174 df-xadd 10175 |
| This theorem is used by: (None) |
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