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| Mirrors > Home > ILE Home > Th. List > rpnegap | GIF version | ||
| Description: Either a real apart from zero or its negation is a positive real, but not both. (Contributed by Jim Kingdon, 23-Mar-2020.) |
| Ref | Expression |
|---|---|
| rpnegap | ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (𝐴 ∈ ℝ+ ⊻ -𝐴 ∈ ℝ+)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 8178 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
| 2 | reapltxor 8768 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 # 0 ↔ (𝐴 < 0 ⊻ 0 < 𝐴))) | |
| 3 | 1, 2 | mpan2 425 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (𝐴 # 0 ↔ (𝐴 < 0 ⊻ 0 < 𝐴))) |
| 4 | xorcom 1432 | . . . . . 6 ⊢ ((𝐴 < 0 ⊻ 0 < 𝐴) ↔ (0 < 𝐴 ⊻ 𝐴 < 0)) | |
| 5 | 3, 4 | bitrdi 196 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (𝐴 # 0 ↔ (0 < 𝐴 ⊻ 𝐴 < 0))) |
| 6 | 5 | pm5.32i 454 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) ↔ (𝐴 ∈ ℝ ∧ (0 < 𝐴 ⊻ 𝐴 < 0))) |
| 7 | anxordi 1444 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ (0 < 𝐴 ⊻ 𝐴 < 0)) ↔ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) ⊻ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) | |
| 8 | 6, 7 | bitri 184 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) ↔ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) ⊻ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) |
| 9 | 8 | biimpi 120 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → ((𝐴 ∈ ℝ ∧ 0 < 𝐴) ⊻ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) |
| 10 | elrp 9889 | . . . 4 ⊢ (𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) | |
| 11 | 10 | a1i 9 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴))) |
| 12 | elrp 9889 | . . . . . 6 ⊢ (-𝐴 ∈ ℝ+ ↔ (-𝐴 ∈ ℝ ∧ 0 < -𝐴)) | |
| 13 | renegcl 8439 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) | |
| 14 | 13 | biantrurd 305 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (0 < -𝐴 ↔ (-𝐴 ∈ ℝ ∧ 0 < -𝐴))) |
| 15 | 12, 14 | bitr4id 199 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (-𝐴 ∈ ℝ+ ↔ 0 < -𝐴)) |
| 16 | lt0neg1 8647 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (𝐴 < 0 ↔ 0 < -𝐴)) | |
| 17 | ibar 301 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (𝐴 < 0 ↔ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) | |
| 18 | 15, 16, 17 | 3bitr2d 216 | . . . 4 ⊢ (𝐴 ∈ ℝ → (-𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) |
| 19 | 18 | adantr 276 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (-𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 𝐴 < 0))) |
| 20 | 11, 19 | xorbi12d 1426 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → ((𝐴 ∈ ℝ+ ⊻ -𝐴 ∈ ℝ+) ↔ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) ⊻ (𝐴 ∈ ℝ ∧ 𝐴 < 0)))) |
| 21 | 9, 20 | mpbird 167 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (𝐴 ∈ ℝ+ ⊻ -𝐴 ∈ ℝ+)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ⊻ wxo 1419 ∈ wcel 2202 class class class wbr 4088 ℝcr 8030 0cc0 8031 < clt 8213 -cneg 8350 # cap 8760 ℝ+crp 9887 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-cnex 8122 ax-resscn 8123 ax-1cn 8124 ax-1re 8125 ax-icn 8126 ax-addcl 8127 ax-addrcl 8128 ax-mulcl 8129 ax-mulrcl 8130 ax-addcom 8131 ax-mulcom 8132 ax-addass 8133 ax-mulass 8134 ax-distr 8135 ax-i2m1 8136 ax-0lt1 8137 ax-1rid 8138 ax-0id 8139 ax-rnegex 8140 ax-precex 8141 ax-cnre 8142 ax-pre-ltirr 8143 ax-pre-ltwlin 8144 ax-pre-lttrn 8145 ax-pre-apti 8146 ax-pre-ltadd 8147 ax-pre-mulgt0 8148 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-xor 1420 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-reu 2517 df-rab 2519 df-v 2804 df-sbc 3032 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-id 4390 df-po 4393 df-iso 4394 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-iota 5286 df-fun 5328 df-fv 5334 df-riota 5970 df-ov 6020 df-oprab 6021 df-mpo 6022 df-pnf 8215 df-mnf 8216 df-ltxr 8218 df-sub 8351 df-neg 8352 df-reap 8754 df-ap 8761 df-rp 9888 |
| This theorem is referenced by: (None) |
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