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| Mirrors > Home > ILE Home > Th. List > Mathboxes > trirec0xor | GIF version | ||
| Description: Version of trirec0 17312 with exclusive-or.
The definition of a discrete field is sometimes stated in terms of exclusive-or but as proved here, this is equivalent to inclusive-or because the two disjuncts cannot be simultaneously true. (Contributed by Jim Kingdon, 10-Jun-2024.) |
| Ref | Expression |
|---|---|
| trirec0xor | ⊢ (∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦 ∨ 𝑦 < 𝑥) ↔ ∀𝑥 ∈ ℝ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ⊻ 𝑥 = 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | trirec0 17312 | . 2 ⊢ (∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦 ∨ 𝑦 < 𝑥) ↔ ∀𝑥 ∈ ℝ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0)) | |
| 2 | 1ne0 9382 | . . . . . . . 8 ⊢ 1 ≠ 0 | |
| 3 | 2 | nesymi 2466 | . . . . . . 7 ⊢ ¬ 0 = 1 |
| 4 | simpr 110 | . . . . . . . . . . 11 ⊢ (((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) → 𝑥 = 0) | |
| 5 | 4 | oveq1d 6103 | . . . . . . . . . 10 ⊢ (((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) → (𝑥 · 𝑧) = (0 · 𝑧)) |
| 6 | mul02lem2 8723 | . . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ → (0 · 𝑧) = 0) | |
| 7 | 5, 6 | sylan9eqr 2293 | . . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0)) → (𝑥 · 𝑧) = 0) |
| 8 | simprl 535 | . . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0)) → (𝑥 · 𝑧) = 1) | |
| 9 | 7, 8 | eqtr3d 2273 | . . . . . . . 8 ⊢ ((𝑧 ∈ ℝ ∧ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0)) → 0 = 1) |
| 10 | 9 | rexlimiva 2663 | . . . . . . 7 ⊢ (∃𝑧 ∈ ℝ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) → 0 = 1) |
| 11 | 3, 10 | mto 672 | . . . . . 6 ⊢ ¬ ∃𝑧 ∈ ℝ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) |
| 12 | r19.41v 2707 | . . . . . 6 ⊢ (∃𝑧 ∈ ℝ ((𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) ↔ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∧ 𝑥 = 0)) | |
| 13 | 11, 12 | mtbi 681 | . . . . 5 ⊢ ¬ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∧ 𝑥 = 0) |
| 14 | 13 | biantru 302 | . . . 4 ⊢ ((∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0) ↔ ((∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0) ∧ ¬ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∧ 𝑥 = 0))) |
| 15 | df-xor 1425 | . . . 4 ⊢ ((∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ⊻ 𝑥 = 0) ↔ ((∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0) ∧ ¬ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∧ 𝑥 = 0))) | |
| 16 | 14, 15 | bitr4i 187 | . . 3 ⊢ ((∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0) ↔ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ⊻ 𝑥 = 0)) |
| 17 | 16 | ralbii 2556 | . 2 ⊢ (∀𝑥 ∈ ℝ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ∨ 𝑥 = 0) ↔ ∀𝑥 ∈ ℝ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ⊻ 𝑥 = 0)) |
| 18 | 1, 17 | bitri 184 | 1 ⊢ (∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦 ∨ 𝑦 < 𝑥) ↔ ∀𝑥 ∈ ℝ (∃𝑧 ∈ ℝ (𝑥 · 𝑧) = 1 ⊻ 𝑥 = 0)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 ∧ wa 104 ↔ wb 105 ∨ wo 720 ∨ w3o 1008 = wceq 1402 ⊻ wxo 1424 ∈ wcel 2209 ∀wral 2528 ∃wrex 2529 class class class wbr 4131 (class class class)co 6088 ℝcr 8185 0cc0 8186 1c1 8187 · cmul 8191 < clt 8367 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304 |
| This proof depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-xor 1425 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-opab 4194 df-id 4440 df-po 4443 df-iso 4444 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-iota 5340 df-fun 5382 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 |
| This theorem is used by: (None) |
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