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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 8146 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
| 2 | reapltxor 8736 | . . . . . . 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 1430 | . . . . . 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 1442 | . . . 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 9851 | . . . 4 ⊢ (𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) | |
| 11 | 10 | a1i 9 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴))) |
| 12 | elrp 9851 | . . . . . 6 ⊢ (-𝐴 ∈ ℝ+ ↔ (-𝐴 ∈ ℝ ∧ 0 < -𝐴)) | |
| 13 | renegcl 8407 | . . . . . . 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 8615 | . . . . 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 1424 | . 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 1417 ∈ wcel 2200 class class class wbr 4083 ℝcr 7998 0cc0 7999 < clt 8181 -cneg 8318 # cap 8728 ℝ+crp 9849 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8090 ax-resscn 8091 ax-1cn 8092 ax-1re 8093 ax-icn 8094 ax-addcl 8095 ax-addrcl 8096 ax-mulcl 8097 ax-mulrcl 8098 ax-addcom 8099 ax-mulcom 8100 ax-addass 8101 ax-mulass 8102 ax-distr 8103 ax-i2m1 8104 ax-0lt1 8105 ax-1rid 8106 ax-0id 8107 ax-rnegex 8108 ax-precex 8109 ax-cnre 8110 ax-pre-ltirr 8111 ax-pre-ltwlin 8112 ax-pre-lttrn 8113 ax-pre-apti 8114 ax-pre-ltadd 8115 ax-pre-mulgt0 8116 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-xor 1418 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-id 4384 df-po 4387 df-iso 4388 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-iota 5278 df-fun 5320 df-fv 5326 df-riota 5954 df-ov 6004 df-oprab 6005 df-mpo 6006 df-pnf 8183 df-mnf 8184 df-ltxr 8186 df-sub 8319 df-neg 8320 df-reap 8722 df-ap 8729 df-rp 9850 |
| This theorem is referenced by: (None) |
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