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Mirrors > Home > ILE Home > Th. List > xaddid1 | GIF version |
Description: Extended real version of addid1 8036. (Contributed by Mario Carneiro, 20-Aug-2015.) |
Ref | Expression |
---|---|
xaddid1 | ⊢ (𝐴 ∈ ℝ* → (𝐴 +𝑒 0) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elxr 9712 | . 2 ⊢ (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞)) | |
2 | 0re 7899 | . . . . 5 ⊢ 0 ∈ ℝ | |
3 | rexadd 9788 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 +𝑒 0) = (𝐴 + 0)) | |
4 | 2, 3 | mpan2 422 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 +𝑒 0) = (𝐴 + 0)) |
5 | recn 7886 | . . . . 5 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
6 | 5 | addid1d 8047 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 + 0) = 𝐴) |
7 | 4, 6 | eqtrd 2198 | . . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 +𝑒 0) = 𝐴) |
8 | 0xr 7945 | . . . . 5 ⊢ 0 ∈ ℝ* | |
9 | renemnf 7947 | . . . . . 6 ⊢ (0 ∈ ℝ → 0 ≠ -∞) | |
10 | 2, 9 | ax-mp 5 | . . . . 5 ⊢ 0 ≠ -∞ |
11 | xaddpnf2 9783 | . . . . 5 ⊢ ((0 ∈ ℝ* ∧ 0 ≠ -∞) → (+∞ +𝑒 0) = +∞) | |
12 | 8, 10, 11 | mp2an 423 | . . . 4 ⊢ (+∞ +𝑒 0) = +∞ |
13 | oveq1 5849 | . . . 4 ⊢ (𝐴 = +∞ → (𝐴 +𝑒 0) = (+∞ +𝑒 0)) | |
14 | id 19 | . . . 4 ⊢ (𝐴 = +∞ → 𝐴 = +∞) | |
15 | 12, 13, 14 | 3eqtr4a 2225 | . . 3 ⊢ (𝐴 = +∞ → (𝐴 +𝑒 0) = 𝐴) |
16 | renepnf 7946 | . . . . . 6 ⊢ (0 ∈ ℝ → 0 ≠ +∞) | |
17 | 2, 16 | ax-mp 5 | . . . . 5 ⊢ 0 ≠ +∞ |
18 | xaddmnf2 9785 | . . . . 5 ⊢ ((0 ∈ ℝ* ∧ 0 ≠ +∞) → (-∞ +𝑒 0) = -∞) | |
19 | 8, 17, 18 | mp2an 423 | . . . 4 ⊢ (-∞ +𝑒 0) = -∞ |
20 | oveq1 5849 | . . . 4 ⊢ (𝐴 = -∞ → (𝐴 +𝑒 0) = (-∞ +𝑒 0)) | |
21 | id 19 | . . . 4 ⊢ (𝐴 = -∞ → 𝐴 = -∞) | |
22 | 19, 20, 21 | 3eqtr4a 2225 | . . 3 ⊢ (𝐴 = -∞ → (𝐴 +𝑒 0) = 𝐴) |
23 | 7, 15, 22 | 3jaoi 1293 | . 2 ⊢ ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → (𝐴 +𝑒 0) = 𝐴) |
24 | 1, 23 | sylbi 120 | 1 ⊢ (𝐴 ∈ ℝ* → (𝐴 +𝑒 0) = 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∨ w3o 967 = wceq 1343 ∈ wcel 2136 ≠ wne 2336 (class class class)co 5842 ℝcr 7752 0cc0 7753 + caddc 7756 +∞cpnf 7930 -∞cmnf 7931 ℝ*cxr 7932 +𝑒 cxad 9706 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1re 7847 ax-addrcl 7850 ax-0id 7861 ax-rnegex 7862 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-rab 2453 df-v 2728 df-sbc 2952 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-if 3521 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-id 4271 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 df-ov 5845 df-oprab 5846 df-mpo 5847 df-pnf 7935 df-mnf 7936 df-xr 7937 df-xadd 9709 |
This theorem is referenced by: xaddid2 9799 xaddid1d 9800 xnn0xadd0 9803 xpncan 9807 psmetsym 12969 psmetge0 12971 xmetge0 13005 xmetsym 13008 |
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