Theorem islpln 35542

Description: The predicate "is a lattice plane". (Contributed by NM, 16-Jun-2012.)

Hypotheses

Ref	Expression
lplnset.b	⊢ 𝐵 = (Base‘𝐾)
lplnset.c	⊢ 𝐶 = ( ⋖ ‘𝐾)
lplnset.n	⊢ 𝑁 = (LLines‘𝐾)
lplnset.p	⊢ 𝑃 = (LPlanes‘𝐾)

Assertion

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

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

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

Proof of Theorem islpln

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		lplnset.b	. . . 4 ⊢ 𝐵 = (Base‘𝐾)
2		lplnset.c	. . . 4 ⊢ 𝐶 = ( ⋖ ‘𝐾)
3		lplnset.n	. . . 4 ⊢ 𝑁 = (LLines‘𝐾)
4		lplnset.p	. . . 4 ⊢ 𝑃 = (LPlanes‘𝐾)
5	1, 2, 3, 4	lplnset 35541	. . 3 ⊢ (𝐾 ∈ 𝐴 → 𝑃 = {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑥})
6	5	eleq2d 2862	. 2 ⊢ (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑃 ↔ 𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑥}))
7		breq2 4845	. . . 4 ⊢ (𝑥 = 𝑋 → (𝑦𝐶𝑥 ↔ 𝑦𝐶𝑋))
8	7	rexbidv 3231	. . 3 ⊢ (𝑥 = 𝑋 → (∃𝑦 ∈ 𝑁 𝑦𝐶𝑥 ↔ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑋))
9	8	elrab 3554	. 2 ⊢ (𝑋 ∈ {𝑥 ∈ 𝐵 ∣ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑥} ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑋))
10	6, 9	syl6bb 279	1 ⊢ (𝐾 ∈ 𝐴 → (𝑋 ∈ 𝑃 ↔ (𝑋 ∈ 𝐵 ∧ ∃𝑦 ∈ 𝑁 𝑦𝐶𝑋)))

Syntax hints:   → wi 4   ↔ wb 198   ∧ wa 385   = wceq 1653   ∈ wcel 2157  ∃wrex 3088  {crab 3091   class class class wbr 4841  ‘cfv 6099  Basecbs 16180   ⋖ ccvr 35274  LLinesclln 35503  LPlanesclpl 35504

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2375  ax-ext 2775  ax-sep 4973  ax-nul 4981  ax-pr 5095

This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2590  df-eu 2607  df-clab 2784  df-cleq 2790  df-clel 2793  df-nfc 2928  df-ral 3092  df-rex 3093  df-rab 3096  df-v 3385  df-sbc 3632  df-dif 3770  df-un 3772  df-in 3774  df-ss 3781  df-nul 4114  df-if 4276  df-sn 4367  df-pr 4369  df-op 4373  df-uni 4627  df-br 4842  df-opab 4904  df-mpt 4921  df-id 5218  df-xp 5316  df-rel 5317  df-cnv 5318  df-co 5319  df-dm 5320  df-iota 6062  df-fun 6101  df-fv 6107  df-lplanes 35511

This theorem is referenced by:  islpln4  35543  lplni  35544  lplnbase  35546  lplnnle2at  35553