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Theorem tsrlemax 17535
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 4847 . . 3 (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐶𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
21bibi1d 335 . 2 (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶))))
3 breq2 4847 . . 3 (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐵𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
43bibi1d 335 . 2 (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶))))
5 olc 895 . . 3 (𝐴𝑅𝐶 → (𝐴𝑅𝐵𝐴𝑅𝐶))
6 eqid 2799 . . . . . . . . . 10 dom 𝑅 = dom 𝑅
76istsr 17532 . . . . . . . . 9 (𝑅 ∈ TosetRel ↔ (𝑅 ∈ PosetRel ∧ (dom 𝑅 × dom 𝑅) ⊆ (𝑅𝑅)))
87simplbi 492 . . . . . . . 8 (𝑅 ∈ TosetRel → 𝑅 ∈ PosetRel)
9 pstr 17526 . . . . . . . . 9 ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶)
1093expib 1153 . . . . . . . 8 (𝑅 ∈ PosetRel → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
118, 10syl 17 . . . . . . 7 (𝑅 ∈ TosetRel → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
1211adantr 473 . . . . . 6 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → ((𝐴𝑅𝐵𝐵𝑅𝐶) → 𝐴𝑅𝐶))
1312expdimp 445 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐴𝑅𝐵) → (𝐵𝑅𝐶𝐴𝑅𝐶))
1413impancom 444 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐵𝐴𝑅𝐶))
15 idd 24 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶𝐴𝑅𝐶))
1614, 15jaod 886 . . 3 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵𝐴𝑅𝐶) → 𝐴𝑅𝐶))
175, 16impbid2 218 . 2 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
18 orc 894 . . 3 (𝐴𝑅𝐵 → (𝐴𝑅𝐵𝐴𝑅𝐶))
19 idd 24 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵𝐴𝑅𝐵))
20 istsr.1 . . . . . . . 8 𝑋 = dom 𝑅
2120tsrlin 17534 . . . . . . 7 ((𝑅 ∈ TosetRel ∧ 𝐵𝑋𝐶𝑋) → (𝐵𝑅𝐶𝐶𝑅𝐵))
22213adant3r1 1234 . . . . . 6 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → (𝐵𝑅𝐶𝐶𝑅𝐵))
2322orcanai 1026 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → 𝐶𝑅𝐵)
24 pstr 17526 . . . . . . . . . 10 ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵)
25243expib 1153 . . . . . . . . 9 (𝑅 ∈ PosetRel → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
268, 25syl 17 . . . . . . . 8 (𝑅 ∈ TosetRel → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
2726adantr 473 . . . . . . 7 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → ((𝐴𝑅𝐶𝐶𝑅𝐵) → 𝐴𝑅𝐵))
2827expdimp 445 . . . . . 6 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐴𝑅𝐶) → (𝐶𝑅𝐵𝐴𝑅𝐵))
2928impancom 444 . . . . 5 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ 𝐶𝑅𝐵) → (𝐴𝑅𝐶𝐴𝑅𝐵))
3023, 29syldan 586 . . . 4 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐶𝐴𝑅𝐵))
3119, 30jaod 886 . . 3 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵𝐴𝑅𝐶) → 𝐴𝑅𝐵))
3218, 31impbid2 218 . 2 (((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
332, 4, 17, 32ifbothda 4314 1 ((𝑅 ∈ TosetRel ∧ (𝐴𝑋𝐵𝑋𝐶𝑋)) → (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵𝐴𝑅𝐶)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 198  wa 385  wo 874  w3a 1108   = wceq 1653  wcel 2157  cun 3767  wss 3769  ifcif 4277   class class class wbr 4843   × cxp 5310  ccnv 5311  dom cdm 5312  PosetRelcps 17513   TosetRel ctsr 17514
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-sep 4975  ax-nul 4983  ax-pr 5097
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3387  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-br 4844  df-opab 4906  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-res 5324  df-ps 17515  df-tsr 17516
This theorem is referenced by:  ordtbaslem  21321
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