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Theorem tsrlemax 17267
Description: Two ways of saying a number is less than or equal to the maximum of two others. (Contributed by Mario Carneiro, 9-Sep-2015.)
Hypothesis
Ref Expression
istsr.1 𝑋 = dom 𝑅
Assertion
Ref Expression
tsrlemax ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))

Proof of Theorem tsrlemax
StepHypRef Expression
1 breq2 4689 . . 3 (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐶𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
21bibi1d 332 . 2 (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶))))
3 breq2 4689 . . 3 (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐵𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
43bibi1d 332 . 2 (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶))))
5 olc 398 . . 3 (𝐴𝑅𝐶 → (𝐴𝑅𝐵𝐴𝑅𝐶))
6 eqid 2651 . . . . . . . . . 10 dom 𝑅 = dom 𝑅
76istsr 17264 . . . . . . . . 9 (𝑅 ∈ TosetRel ↔ (𝑅 ∈ PosetRel ∧ (dom 𝑅 × dom 𝑅) ⊆ (𝑅𝑅)))
87simplbi 475 . . . . . . . 8 (𝑅 ∈ TosetRel → 𝑅 ∈ PosetRel)
9 pstr 17258 . . . . . . . . 9 ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶)
1093expib 1287 . . . . . . . 8 (𝑅 ∈ PosetRel → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
118, 10syl 17 . . . . . . 7 (𝑅 ∈ TosetRel → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
1211adantr 480 . . . . . 6 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
1312expdimp 452 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐴𝑅𝐵) → (𝐵𝑅𝐶𝐴𝑅𝐶))
1413impancom 455 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐵𝐴𝑅𝐶))
15 idd 24 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶𝐴𝑅𝐶))
1614, 15jaod 394 . . 3 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵𝐴𝑅𝐶) → 𝐴𝑅𝐶))
175, 16impbid2 216 . 2 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
18 orc 399 . . 3 (𝐴𝑅𝐵 → (𝐴𝑅𝐵𝐴𝑅𝐶))
19 idd 24 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵𝐴𝑅𝐵))
20 istsr.1 . . . . . . . 8 𝑋 = dom 𝑅
2120tsrlin 17266 . . . . . . 7 ((𝑅 ∈ TosetRel ∧ 𝐵𝑋𝐶𝑋) → (𝐵𝑅𝐶𝐶𝑅𝐵))
22213adant3r1 1295 . . . . . 6 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → (𝐵𝑅𝐶𝐶𝑅𝐵))
2322orcanai 972 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → 𝐶𝑅𝐵)
24 pstr 17258 . . . . . . . . . 10 ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵)
25243expib 1287 . . . . . . . . 9 (𝑅 ∈ PosetRel → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
268, 25syl 17 . . . . . . . 8 (𝑅 ∈ TosetRel → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
2726adantr 480 . . . . . . 7 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
2827expdimp 452 . . . . . 6 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐴𝑅𝐶) → (𝐶𝑅𝐵𝐴𝑅𝐵))
2928impancom 455 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐶𝑅𝐵) → (𝐴𝑅𝐶𝐴𝑅𝐵))
3023, 29syldan 486 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐶𝐴𝑅𝐵))
3119, 30jaod 394 . . 3 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵𝐴𝑅𝐶) → 𝐴𝑅𝐵))
3218, 31impbid2 216 . 2 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
332, 4, 17, 32ifbothda 4156 1 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3a 1054   = wceq 1523  wcel 2030  cun 3605  wss 3607  ifcif 4119   class class class wbr 4685   × cxp 5141  ccnv 5142  dom cdm 5143  PosetRelcps 17245   TosetRel ctsr 17246
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pr 4936
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-res 5155  df-ps 17247  df-tsr 17248
This theorem is referenced by:  ordtbaslem  21040
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