Theorem tsrlemax 18544

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 ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) → (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)))

Proof of Theorem tsrlemax

Step	Hyp	Ref	Expression
1		breq2 5152	. . 3 ⊢ (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐶 ↔ 𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
2	1	bibi1d 343	. 2 ⊢ (𝐶 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶))))
3		breq2 5152	. . 3 ⊢ (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → (𝐴𝑅𝐵 ↔ 𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵)))
4	3	bibi1d 343	. 2 ⊢ (𝐵 = if(𝐵𝑅𝐶, 𝐶, 𝐵) → ((𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)) ↔ (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶))))
5		olc 865	. . 3 ⊢ (𝐴𝑅𝐶 → (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶))
6		eqid 2731	. . . . . . . . . 10 ⊢ dom 𝑅 = dom 𝑅
7	6	istsr 18541	. . . . . . . . 9 ⊢ (𝑅 ∈ TosetRel ↔ (𝑅 ∈ PosetRel ∧ (dom 𝑅 × dom 𝑅) ⊆ (𝑅 ∪ ◡𝑅)))
8	7	simplbi 497	. . . . . . . 8 ⊢ (𝑅 ∈ TosetRel → 𝑅 ∈ PosetRel)
9		pstr 18535	. . . . . . . . 9 ⊢ ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐵 ∧ 𝐵𝑅𝐶) → 𝐴𝑅𝐶)
10	9	3expib 1121	. . . . . . . 8 ⊢ (𝑅 ∈ PosetRel → ((𝐴𝑅𝐵 ∧ 𝐵𝑅𝐶) → 𝐴𝑅𝐶))
11	8, 10	syl 17	. . . . . . 7 ⊢ (𝑅 ∈ TosetRel → ((𝐴𝑅𝐵 ∧ 𝐵𝑅𝐶) → 𝐴𝑅𝐶))
12	11	adantr 480	. . . . . 6 ⊢ ((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) → ((𝐴𝑅𝐵 ∧ 𝐵𝑅𝐶) → 𝐴𝑅𝐶))
13	12	expdimp 452	. . . . 5 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐴𝑅𝐵) → (𝐵𝑅𝐶 → 𝐴𝑅𝐶))
14	13	impancom 451	. . . 4 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐵 → 𝐴𝑅𝐶))
15		idd 24	. . . 4 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶 → 𝐴𝑅𝐶))
16	14, 15	jaod 856	. . 3 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶) → 𝐴𝑅𝐶))
17	5, 16	impbid2 225	. 2 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐵𝑅𝐶) → (𝐴𝑅𝐶 ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)))
18		orc 864	. . 3 ⊢ (𝐴𝑅𝐵 → (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶))
19		idd 24	. . . 4 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵 → 𝐴𝑅𝐵))
20		istsr.1	. . . . . . . 8 ⊢ 𝑋 = dom 𝑅
21	20	tsrlin 18543	. . . . . . 7 ⊢ ((𝑅 ∈ TosetRel ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋) → (𝐵𝑅𝐶 ∨ 𝐶𝑅𝐵))
22	21	3adant3r1 1181	. . . . . 6 ⊢ ((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) → (𝐵𝑅𝐶 ∨ 𝐶𝑅𝐵))
23	22	orcanai 1000	. . . . 5 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ ¬ 𝐵𝑅𝐶) → 𝐶𝑅𝐵)
24		pstr 18535	. . . . . . . . . 10 ⊢ ((𝑅 ∈ PosetRel ∧ 𝐴𝑅𝐶 ∧ 𝐶𝑅𝐵) → 𝐴𝑅𝐵)
25	24	3expib 1121	. . . . . . . . 9 ⊢ (𝑅 ∈ PosetRel → ((𝐴𝑅𝐶 ∧ 𝐶𝑅𝐵) → 𝐴𝑅𝐵))
26	8, 25	syl 17	. . . . . . . 8 ⊢ (𝑅 ∈ TosetRel → ((𝐴𝑅𝐶 ∧ 𝐶𝑅𝐵) → 𝐴𝑅𝐵))
27	26	adantr 480	. . . . . . 7 ⊢ ((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) → ((𝐴𝑅𝐶 ∧ 𝐶𝑅𝐵) → 𝐴𝑅𝐵))
28	27	expdimp 452	. . . . . 6 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐴𝑅𝐶) → (𝐶𝑅𝐵 → 𝐴𝑅𝐵))
29	28	impancom 451	. . . . 5 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ 𝐶𝑅𝐵) → (𝐴𝑅𝐶 → 𝐴𝑅𝐵))
30	23, 29	syldan 590	. . . 4 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐶 → 𝐴𝑅𝐵))
31	19, 30	jaod 856	. . 3 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ ¬ 𝐵𝑅𝐶) → ((𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶) → 𝐴𝑅𝐵))
32	18, 31	impbid2 225	. 2 ⊢ (((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) ∧ ¬ 𝐵𝑅𝐶) → (𝐴𝑅𝐵 ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)))
33	2, 4, 17, 32	ifbothda 4566	1 ⊢ ((𝑅 ∈ TosetRel ∧ (𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋 ∧ 𝐶 ∈ 𝑋)) → (𝐴𝑅if(𝐵𝑅𝐶, 𝐶, 𝐵) ↔ (𝐴𝑅𝐵 ∨ 𝐴𝑅𝐶)))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 205   ∧ wa 395   ∨ wo 844   ∧ w3a 1086   = wceq 1540   ∈ wcel 2105   ∪ cun 3946   ⊆ wss 3948  ifcif 4528   class class class wbr 5148   × cxp 5674  ^◡ccnv 5675  dom cdm 5676  PosetRelcps 18522   TosetRel ctsr 18523

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-ext 2702  ax-sep 5299  ax-nul 5306  ax-pr 5427

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-sb 2067  df-clab 2709  df-cleq 2723  df-clel 2809  df-ral 3061  df-rex 3070  df-rab 3432  df-v 3475  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-res 5688  df-ps 18524  df-tsr 18525

This theorem is referenced by:  ordtbaslem  22913