Theorem infiso 9415

Description: Image of an infimum under an isomorphism. (Contributed by AV, 4-Sep-2020.)

Hypotheses

Ref	Expression
infiso.1	⊢ (𝜑 → 𝐹 Isom 𝑅, 𝑆 (𝐴, 𝐵))
infiso.2	⊢ (𝜑 → 𝐶 ⊆ 𝐴)
infiso.3	⊢ (𝜑 → ∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐶 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦 ∈ 𝐴 (𝑥𝑅𝑦 → ∃𝑧 ∈ 𝐶 𝑧𝑅𝑦)))
infiso.4	⊢ (𝜑 → 𝑅 Or 𝐴)

Assertion

Ref	Expression
infiso	⊢ (𝜑 → inf((𝐹 “ 𝐶), 𝐵, 𝑆) = (𝐹‘inf(𝐶, 𝐴, 𝑅)))

Distinct variable groups:   𝑥,𝐴,𝑦,𝑧   𝑥,𝐵,𝑦,𝑧   𝑥,𝐶,𝑦,𝑧   𝑥,𝐹,𝑦,𝑧   𝑥,𝑅,𝑦,𝑧   𝑥,𝑆,𝑦,𝑧   𝜑,𝑥,𝑦,𝑧

Proof of Theorem infiso

Step	Hyp	Ref	Expression
1		infiso.1	. . . 4 ⊢ (𝜑 → 𝐹 Isom 𝑅, 𝑆 (𝐴, 𝐵))
2		isocnv2 7277	. . . 4 ⊢ (𝐹 Isom 𝑅, 𝑆 (𝐴, 𝐵) ↔ 𝐹 Isom ◡𝑅, ◡𝑆(𝐴, 𝐵))
3	1, 2	sylib 218	. . 3 ⊢ (𝜑 → 𝐹 Isom ◡𝑅, ◡𝑆(𝐴, 𝐵))
4		infiso.2	. . 3 ⊢ (𝜑 → 𝐶 ⊆ 𝐴)
5		infiso.4	. . . 4 ⊢ (𝜑 → 𝑅 Or 𝐴)
6		infiso.3	. . . 4 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐶 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦 ∈ 𝐴 (𝑥𝑅𝑦 → ∃𝑧 ∈ 𝐶 𝑧𝑅𝑦)))
7	5, 6	infcllem 9393	. . 3 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐶 ¬ 𝑥◡𝑅𝑦 ∧ ∀𝑦 ∈ 𝐴 (𝑦◡𝑅𝑥 → ∃𝑧 ∈ 𝐶 𝑦◡𝑅𝑧)))
8		cnvso 6245	. . . 4 ⊢ (𝑅 Or 𝐴 ↔ ◡𝑅 Or 𝐴)
9	5, 8	sylib 218	. . 3 ⊢ (𝜑 → ◡𝑅 Or 𝐴)
10	3, 4, 7, 9	supiso 9381	. 2 ⊢ (𝜑 → sup((𝐹 “ 𝐶), 𝐵, ◡𝑆) = (𝐹‘sup(𝐶, 𝐴, ◡𝑅)))
11		df-inf 9348	. 2 ⊢ inf((𝐹 “ 𝐶), 𝐵, 𝑆) = sup((𝐹 “ 𝐶), 𝐵, ◡𝑆)
12		df-inf 9348	. . 3 ⊢ inf(𝐶, 𝐴, 𝑅) = sup(𝐶, 𝐴, ◡𝑅)
13	12	fveq2i 6836	. 2 ⊢ (𝐹‘inf(𝐶, 𝐴, 𝑅)) = (𝐹‘sup(𝐶, 𝐴, ◡𝑅))
14	10, 11, 13	3eqtr4g 2795	1 ⊢ (𝜑 → inf((𝐹 “ 𝐶), 𝐵, 𝑆) = (𝐹‘inf(𝐶, 𝐴, 𝑅)))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 395   = wceq 1542  ∀wral 3050  ∃wrex 3059   ⊆ wss 3900   class class class wbr 5097   Or wor 5530  ^◡ccnv 5622   “ cima 5626  ‘cfv 6491   Isom wiso 6492  supcsup 9345  infcinf 9346

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2183  ax-ext 2707  ax-sep 5240  ax-nul 5250  ax-pr 5376

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2538  df-eu 2568  df-clab 2714  df-cleq 2727  df-clel 2810  df-nfc 2884  df-ne 2932  df-ral 3051  df-rex 3060  df-rmo 3349  df-reu 3350  df-rab 3399  df-v 3441  df-sbc 3740  df-dif 3903  df-un 3905  df-in 3907  df-ss 3917  df-nul 4285  df-if 4479  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-br 5098  df-opab 5160  df-mpt 5179  df-id 5518  df-po 5531  df-so 5532  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-iota 6447  df-fun 6493  df-fn 6494  df-f 6495  df-f1 6496  df-fo 6497  df-f1o 6498  df-fv 6499  df-isom 6500  df-riota 7315  df-sup 9347  df-inf 9348

This theorem is referenced by: (None)