Theorem islvol 36711

Description: The predicate "is a 3-dim lattice volume". (Contributed by NM, 1-Jul-2012.)

Hypotheses

Ref	Expression
lvolset.b	⊢ 𝐵 = (Base‘𝐾)
lvolset.c	⊢ 𝐶 = ( ⋖ ‘𝐾)
lvolset.p	⊢ 𝑃 = (LPlanes‘𝐾)
lvolset.v	⊢ 𝑉 = (LVols‘𝐾)

Assertion

Ref	Expression
islvol	⊢ (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑉 ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋)))

Distinct variable groups:   𝑦,𝑃   𝑦,𝐾   𝑦,𝑋

Allowed substitution hints:   𝐴(𝑦)   𝐵(𝑦)   𝐶(𝑦)   𝑉(𝑦)

Proof of Theorem islvol

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		lvolset.b	. . . 4 ⊢ 𝐵 = (Base‘𝐾)
2		lvolset.c	. . . 4 ⊢ 𝐶 = ( ⋖ ‘𝐾)
3		lvolset.p	. . . 4 ⊢ 𝑃 = (LPlanes‘𝐾)
4		lvolset.v	. . . 4 ⊢ 𝑉 = (LVols‘𝐾)
5	1, 2, 3, 4	lvolset 36710	. . 3 ⊢ (𝐾 ∈ 𝐴 → 𝑉 = {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥})
6	5	eleq2d 2900	. 2 ⊢ (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑉 ↔ 𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥}))
7		breq2 5072	. . . 4 ⊢ (𝑥 = 𝑋 → (𝑦𝐶𝑥 ↔ 𝑦𝐶𝑋))
8	7	rexbidv 3299	. . 3 ⊢ (𝑥 = 𝑋 → (∃𝑦 ∈ 𝑃 𝑦𝐶𝑥 ↔ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋))
9	8	elrab 3682	. 2 ⊢ (𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥} ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋))
10	6, 9	syl6bb 289	1 ⊢ (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑉 ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋)))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537   ∈ wcel 2114  ∃wrex 3141  {crab 3144   class class class wbr 5068  ‘cfv 6357  Basecbs 16485   ⋖ ccvr 36400  LPlanesclpl 36630  LVolsclvol 36631

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 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pr 5332

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-iota 6316  df-fun 6359  df-fv 6365  df-lvols 36638

This theorem is referenced by:  islvol4  36712  lvoli  36713  lvolbase  36716  lvolnle3at  36720