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Theorem islvol 40598
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.
StepHypRef 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)
51, 2, 3, 4lvolset 40597 . . 3 (𝐾 ∈ 𝐴 → 𝑉 = {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥})
65eleq2d 2847 . 2 (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑉 ↔ 𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥}))
7 breq2 5107 . . . 4 (𝑥 = 𝑋 → (𝑦𝐶𝑥 ↔ 𝑦𝐶𝑋))
87rexbidv 3187 . . 3 (𝑥 = 𝑋 → (∃𝑦 ∈ 𝑃 𝑦𝐶𝑥 ↔ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋))
98elrab 3645 . 2 (𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑥} ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋))
106, 9bitrdi 290 1 (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑉 ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑃 𝑦𝐶𝑋)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570   ∈ wcel 2145  ∃wrex 3087  {crab 3413   class class class wbr 5103  ‘cfv 6531  Basecbs 17367   ⋖ ccvr 40287  LPlanesclpl 40517  LVolsclvol 40518
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-iota 6487  df-fun 6533  df-fv 6539  df-lvols 40525
This theorem is used by:  islvol4  40599  lvoli  40600  lvolbase  40603  lvolnle3at  40607
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