Theorem sspwtr 42479

Description: Virtual deduction proof of the right-to-left implication of dftr4 5205. A class which is a subclass of its power class is transitive. This proof corresponds to the virtual deduction proof of sspwtr 42479 without accumulating results. (Contributed by Alan Sare, 2-May-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
sspwtr	⊢ (𝐴 ⊆ 𝒫 𝐴 → Tr 𝐴)

Proof of Theorem sspwtr

Dummy variables 𝑧 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dftr2 5200	. . 3 ⊢ (Tr 𝐴 ↔ ∀𝑧∀𝑦((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝐴))
2		idn1 42232	. . . . . . . 8 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ▶   𝐴 ⊆ 𝒫 𝐴   )
3		idn2 42271	. . . . . . . . 9 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   )
4		simpr 486	. . . . . . . . 9 ⊢ ((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ 𝐴)
5	3, 4	e2 42289	. . . . . . . 8 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   𝑦 ∈ 𝐴   )
6		ssel 3919	. . . . . . . 8 ⊢ (𝐴 ⊆ 𝒫 𝐴 → (𝑦 ∈ 𝐴 → 𝑦 ∈ 𝒫 𝐴))
7	2, 5, 6	e12 42382	. . . . . . 7 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   𝑦 ∈ 𝒫 𝐴   )
8		elpwi 4546	. . . . . . 7 ⊢ (𝑦 ∈ 𝒫 𝐴 → 𝑦 ⊆ 𝐴)
9	7, 8	e2 42289	. . . . . 6 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   𝑦 ⊆ 𝐴   )
10		simpl 484	. . . . . . 7 ⊢ ((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝑦)
11	3, 10	e2 42289	. . . . . 6 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   𝑧 ∈ 𝑦   )
12		ssel 3919	. . . . . 6 ⊢ (𝑦 ⊆ 𝐴 → (𝑧 ∈ 𝑦 → 𝑧 ∈ 𝐴))
13	9, 11, 12	e22 42329	. . . . 5 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ,   (𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴)   ▶   𝑧 ∈ 𝐴   )
14	13	in2 42263	. . . 4 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ▶   ((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝐴)   )
15	14	gen12 42276	. . 3 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ▶   ∀𝑧∀𝑦((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝐴)   )
16		biimpr 219	. . 3 ⊢ ((Tr 𝐴 ↔ ∀𝑧∀𝑦((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝐴)) → (∀𝑧∀𝑦((𝑧 ∈ 𝑦 ∧ 𝑦 ∈ 𝐴) → 𝑧 ∈ 𝐴) → Tr 𝐴))
17	1, 15, 16	e01 42349	. 2 ⊢ (   𝐴 ⊆ 𝒫 𝐴   ▶   Tr 𝐴   )
18	17	in1 42229	1 ⊢ (𝐴 ⊆ 𝒫 𝐴 → Tr 𝐴)

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 397  ∀wal 1537   ∈ wcel 2104   ⊆ wss 3892  𝒫 cpw 4539  Tr wtr 5198

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-ext 2707

This theorem depends on definitions:  df-bi 206  df-an 398  df-tru 1542  df-ex 1780  df-sb 2066  df-clab 2714  df-cleq 2728  df-clel 2814  df-v 3439  df-in 3899  df-ss 3909  df-pw 4541  df-uni 4845  df-tr 5199  df-vd1 42228  df-vd2 42236

This theorem is referenced by: (None)