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Theorem lvolbase 40330
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 4294 . . . 4 (𝑋𝑉 → ¬ 𝑉 = ∅)
2 lvolbase.v . . . . 5 𝑉 = (LVols‘𝐾)
32eqeq1i 2768 . . . 4 (𝑉 = ∅ ↔ (LVols‘𝐾) = ∅)
41, 3sylnib 331 . . 3 (𝑋𝑉 → ¬ (LVols‘𝐾) = ∅)
5 fvprc 6875 . . 3 𝐾 ∈ V → (LVols‘𝐾) = ∅)
64, 5nsyl2 142 . 2 (𝑋𝑉𝐾 ∈ V)
7 lvolbase.b . . . 4 𝐵 = (Base‘𝐾)
8 eqid 2763 . . . 4 ( ⋖ ‘𝐾) = ( ⋖ ‘𝐾)
9 eqid 2763 . . . 4 (LPlanes‘𝐾) = (LPlanes‘𝐾)
107, 8, 9, 2islvol 40325 . . 3 (𝐾 ∈ V → (𝑋𝑉 ↔ (𝑋𝐵 ∧ ∃𝑥 ∈ (LPlanes‘𝐾)𝑥( ⋖ ‘𝐾)𝑋)))
1110simprbda 503 . 2 ((𝐾 ∈ V ∧ 𝑋𝑉) → 𝑋𝐵)
126, 11mpancom 700 1 (𝑋𝑉𝑋𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1570  wcel 2143  wrex 3089  Vcvv 3455  c0 4287   class class class wbr 5110  cfv 6538  Basecbs 17270  ccvr 40014  LPlanesclpl 40244  LVolsclvol 40245
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pr 5406
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6494  df-fun 6540  df-fv 6546  df-lvols 40252
This theorem is referenced by:  islvol2  40332  lvolnle3at  40334  lvolneatN  40340  lvolnelln  40341  lvolnelpln  40342  lplncvrlvol2  40367  lvolcmp  40369  2lplnja  40371
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