Theorem ispautN 41156

Description: The predicate "is a projective automorphism". (Contributed by NM, 26-Jan-2012.) (New usage is discouraged.)

Hypotheses

Ref	Expression
pautset.s	⊢ 𝑆 = (PSubSp‘𝐾)
pautset.m	⊢ 𝑀 = (PAut‘𝐾)

Assertion

Ref	Expression
ispautN	⊢ (𝐾 ∈ 𝐵 → (𝐹 ∈ 𝑀 ↔ (𝐹:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦)))))

Distinct variable groups:   𝑥,𝑦,𝐹   𝑥,𝐾   𝑥,𝑆,𝑦

Allowed substitution hints:   𝐵(𝑥, 𝑦)   𝐾(𝑦)   𝑀(𝑥, 𝑦)

Proof of Theorem ispautN

Dummy variable 𝑓 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		pautset.s	. . . 4 ⊢ 𝑆 = (PSubSp‘𝐾)
2		pautset.m	. . . 4 ⊢ 𝑀 = (PAut‘𝐾)
3	1, 2	pautsetN 41155	. . 3 ⊢ (𝐾 ∈ 𝐵 → 𝑀 = {𝑓 ∣ (𝑓:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦)))})
4	3	eleq2d 2847	. 2 ⊢ (𝐾 ∈ 𝐵 → (𝐹 ∈ 𝑀 ↔ 𝐹 ∈ {𝑓 ∣ (𝑓:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦)))}))
5		f1of 6824	. . . . 5 ⊢ (𝐹:𝑆–1-1-onto→𝑆 → 𝐹:𝑆⟶𝑆)
6	1	fvexi 6899	. . . . 5 ⊢ 𝑆 ∈ V
7		fex 7232	. . . . 5 ⊢ ((𝐹:𝑆⟶𝑆 ∧ 𝑆 ∈ V) → 𝐹 ∈ V)
8	5, 6, 7	sylancl 598	. . . 4 ⊢ (𝐹:𝑆–1-1-onto→𝑆 → 𝐹 ∈ V)
9	8	adantr 486	. . 3 ⊢ ((𝐹:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦))) → 𝐹 ∈ V)
10		f1oeq1 6812	. . . 4 ⊢ (𝑓 = 𝐹 → (𝑓:𝑆–1-1-onto→𝑆 ↔ 𝐹:𝑆–1-1-onto→𝑆))
11		fveq1 6884	. . . . . . 7 ⊢ (𝑓 = 𝐹 → (𝑓‘𝑥) = (𝐹‘𝑥))
12		fveq1 6884	. . . . . . 7 ⊢ (𝑓 = 𝐹 → (𝑓‘𝑦) = (𝐹‘𝑦))
13	11, 12	sseq12d 3964	. . . . . 6 ⊢ (𝑓 = 𝐹 → ((𝑓‘𝑥) ⊆ (𝑓‘𝑦) ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦)))
14	13	bibi2d 345	. . . . 5 ⊢ (𝑓 = 𝐹 → ((𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦)) ↔ (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦))))
15	14	2ralbidv 3227	. . . 4 ⊢ (𝑓 = 𝐹 → (∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦)) ↔ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦))))
16	10, 15	anbi12d 644	. . 3 ⊢ (𝑓 = 𝐹 → ((𝑓:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦))) ↔ (𝐹:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦)))))
17	9, 16	elab3 3640	. 2 ⊢ (𝐹 ∈ {𝑓 ∣ (𝑓:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝑓‘𝑥) ⊆ (𝑓‘𝑦)))} ↔ (𝐹:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦))))
18	4, 17	bitrdi 290	1 ⊢ (𝐾 ∈ 𝐵 → (𝐹 ∈ 𝑀 ↔ (𝐹:𝑆–1-1-onto→𝑆 ∧ ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥 ⊆ 𝑦 ↔ (𝐹‘𝑥) ⊆ (𝐹‘𝑦)))))

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570   ∈ wcel 2145  {cab 2739  ∀wral 3077  Vcvv 3451   ⊆ wss 3899  ⟶wf 6534  –1-1-onto→wf1o 6537  ‘cfv 6538  PSubSpcpsubsp 40553  PAutcpautN 41044

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-rep 5232  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7751

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-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  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-iun 4953  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-rn 5662  df-res 5663  df-ima 5664  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-map 8849  df-pautN 41048

This theorem is used by: (None)