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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 9646 | . . . . 5 ⊢ (𝐵 ∈ ℝ* → -𝑒-𝑒𝐵 = 𝐵) | |
3 | 2 | eqeq2d 2152 | . . . 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 9668 | . . . 4 ⊢ (𝜑 → -𝑒𝐵 ∈ ℝ*) |
7 | xneg11 9647 | . . . 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 2142 | . 2 ⊢ (𝐴 = -𝑒𝐵 ↔ -𝑒𝐵 = 𝐴) | |
11 | 9, 10 | syl6bb 195 | 1 ⊢ (𝜑 → (-𝑒𝐴 = 𝐵 ↔ -𝑒𝐵 = 𝐴)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 = wceq 1332 ∈ wcel 1481 ℝ*cxr 7823 -𝑒cxne 9586 |
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 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-cnex 7735 ax-resscn 7736 ax-1cn 7737 ax-icn 7739 ax-addcl 7740 ax-addrcl 7741 ax-mulcl 7742 ax-addcom 7744 ax-addass 7746 ax-distr 7748 ax-i2m1 7749 ax-0id 7752 ax-rnegex 7753 ax-cnre 7755 |
This theorem depends on definitions: df-bi 116 df-3or 964 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-nel 2405 df-ral 2422 df-rex 2423 df-reu 2424 df-rab 2426 df-v 2691 df-sbc 2914 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-if 3480 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-opab 3998 df-id 4223 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-iota 5096 df-fun 5133 df-fv 5139 df-riota 5738 df-ov 5785 df-oprab 5786 df-mpo 5787 df-pnf 7826 df-mnf 7827 df-xr 7828 df-sub 7959 df-neg 7960 df-xneg 9589 |
This theorem is referenced by: xrminmax 11066 xrmineqinf 11070 |
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