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Mirrors > Home > ILE Home > Th. List > xrnegcon1d | GIF version |
Description: Contraposition law for extended real unary minus. (Contributed by Jim Kingdon, 2-May-2023.) |
Ref | Expression |
---|---|
xrnegcon1d.a | ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
xrnegcon1d.b | ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
Ref | Expression |
---|---|
xrnegcon1d | ⊢ (𝜑 → (-𝑒𝐴 = 𝐵 ↔ -𝑒𝐵 = 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xrnegcon1d.b | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
2 | xnegneg 9769 | . . . . 5 ⊢ (𝐵 ∈ ℝ* → -𝑒-𝑒𝐵 = 𝐵) | |
3 | 2 | eqeq2d 2177 | . . . 4 ⊢ (𝐵 ∈ ℝ* → (-𝑒𝐴 = -𝑒-𝑒𝐵 ↔ -𝑒𝐴 = 𝐵)) |
4 | 1, 3 | syl 14 | . . 3 ⊢ (𝜑 → (-𝑒𝐴 = -𝑒-𝑒𝐵 ↔ -𝑒𝐴 = 𝐵)) |
5 | xrnegcon1d.a | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ*) | |
6 | 1 | xnegcld 9791 | . . . 4 ⊢ (𝜑 → -𝑒𝐵 ∈ ℝ*) |
7 | xneg11 9770 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ -𝑒𝐵 ∈ ℝ*) → (-𝑒𝐴 = -𝑒-𝑒𝐵 ↔ 𝐴 = -𝑒𝐵)) | |
8 | 5, 6, 7 | syl2anc 409 | . . 3 ⊢ (𝜑 → (-𝑒𝐴 = -𝑒-𝑒𝐵 ↔ 𝐴 = -𝑒𝐵)) |
9 | 4, 8 | bitr3d 189 | . 2 ⊢ (𝜑 → (-𝑒𝐴 = 𝐵 ↔ 𝐴 = -𝑒𝐵)) |
10 | eqcom 2167 | . 2 ⊢ (𝐴 = -𝑒𝐵 ↔ -𝑒𝐵 = 𝐴) | |
11 | 9, 10 | bitrdi 195 | 1 ⊢ (𝜑 → (-𝑒𝐴 = 𝐵 ↔ -𝑒𝐵 = 𝐴)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 = wceq 1343 ∈ wcel 2136 ℝ*cxr 7932 -𝑒cxne 9705 |
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-1cn 7846 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-addcom 7853 ax-addass 7855 ax-distr 7857 ax-i2m1 7858 ax-0id 7861 ax-rnegex 7862 ax-cnre 7864 |
This theorem depends on definitions: df-bi 116 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-reu 2451 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-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-pnf 7935 df-mnf 7936 df-xr 7937 df-sub 8071 df-neg 8072 df-xneg 9708 |
This theorem is referenced by: xrminmax 11206 xrmineqinf 11210 |
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