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Theorem lvoli 37275
Description: Condition implying 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
lvoli (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → 𝑌𝑉)

Proof of Theorem lvoli
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 simpl2 1194 . 2 (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → 𝑌𝐵)
2 breq1 5042 . . . 4 (𝑥 = 𝑋 → (𝑥𝐶𝑌𝑋𝐶𝑌))
32rspcev 3527 . . 3 ((𝑋𝑃𝑋𝐶𝑌) → ∃𝑥𝑃 𝑥𝐶𝑌)
433ad2antl3 1189 . 2 (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → ∃𝑥𝑃 𝑥𝐶𝑌)
5 simpl1 1193 . . 3 (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → 𝐾𝐷)
6 lvolset.b . . . 4 𝐵 = (Base‘𝐾)
7 lvolset.c . . . 4 𝐶 = ( ⋖ ‘𝐾)
8 lvolset.p . . . 4 𝑃 = (LPlanes‘𝐾)
9 lvolset.v . . . 4 𝑉 = (LVols‘𝐾)
106, 7, 8, 9islvol 37273 . . 3 (𝐾𝐷 → (𝑌𝑉 ↔ (𝑌𝐵 ∧ ∃𝑥𝑃 𝑥𝐶𝑌)))
115, 10syl 17 . 2 (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → (𝑌𝑉 ↔ (𝑌𝐵 ∧ ∃𝑥𝑃 𝑥𝐶𝑌)))
121, 4, 11mpbir2and 713 1 (((𝐾𝐷𝑌𝐵𝑋𝑃) ∧ 𝑋𝐶𝑌) → 𝑌𝑉)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399  w3a 1089   = wceq 1543  wcel 2112  wrex 3052   class class class wbr 5039  cfv 6358  Basecbs 16666  ccvr 36962  LPlanesclpl 37192  LVolsclvol 37193
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2160  ax-12 2177  ax-ext 2708  ax-sep 5177  ax-nul 5184  ax-pr 5307
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2073  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2728  df-clel 2809  df-nfc 2879  df-ral 3056  df-rex 3057  df-rab 3060  df-v 3400  df-sbc 3684  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4224  df-if 4426  df-sn 4528  df-pr 4530  df-op 4534  df-uni 4806  df-br 5040  df-opab 5102  df-mpt 5121  df-id 5440  df-xp 5542  df-rel 5543  df-cnv 5544  df-co 5545  df-dm 5546  df-iota 6316  df-fun 6360  df-fv 6366  df-lvols 37200
This theorem is referenced by:  lplncvrlvol  37316
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