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Theorem lvolbase 40077
Description: A 3-dim lattice volume is a lattice element. (Contributed by NM, 1-Jul-2012.)
Hypotheses
Ref Expression
lvolbase.b 𝐵 = (Base‘𝐾)
lvolbase.v 𝑉 = (LVols‘𝐾)
Assertion
Ref Expression
lvolbase (𝑋𝑉𝑋𝐵)

Proof of Theorem lvolbase
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 n0i 4275 . . . 4 (𝑋𝑉 → ¬ 𝑉 = ∅)
2 lvolbase.v . . . . 5 𝑉 = (LVols‘𝐾)
32eqeq1i 2745 . . . 4 (𝑉 = ∅ ↔ (LVols‘𝐾) = ∅)
41, 3sylnib 329 . . 3 (𝑋𝑉 → ¬ (LVols‘𝐾) = ∅)
5 fvprc 6826 . . 3 𝐾 ∈ V → (LVols‘𝐾) = ∅)
64, 5nsyl2 141 . 2 (𝑋𝑉𝐾 ∈ V)
7 lvolbase.b . . . 4 𝐵 = (Base‘𝐾)
8 eqid 2740 . . . 4 ( ⋖ ‘𝐾) = ( ⋖ ‘𝐾)
9 eqid 2740 . . . 4 (LPlanes‘𝐾) = (LPlanes‘𝐾)
107, 8, 9, 2islvol 40072 . . 3 (𝐾 ∈ V → (𝑋𝑉 ↔ (𝑋𝐵 ∧ ∃𝑥 ∈ (LPlanes‘𝐾)𝑥( ⋖ ‘𝐾)𝑋)))
1110simprbda 499 . 2 ((𝐾 ∈ V ∧ 𝑋𝑉) → 𝑋𝐵)
126, 11mpancom 694 1 (𝑋𝑉𝑋𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1547  wcel 2119  wrex 3064  Vcvv 3432  c0 4268   class class class wbr 5079  cfv 6492  Basecbs 17177  ccvr 39761  LPlanesclpl 39991  LVolsclvol 39992
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-nul 5235  ax-pr 5369
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-nfc 2889  df-ne 2936  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4269  df-if 4462  df-pw 4538  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-opab 5142  df-mpt 5161  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-iota 6448  df-fun 6494  df-fv 6500  df-lvols 39999
This theorem is referenced by:  islvol2  40079  lvolnle3at  40081  lvolneatN  40087  lvolnelln  40088  lvolnelpln  40089  lplncvrlvol2  40114  lvolcmp  40116  2lplnja  40118
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