Theorem pwpwssunieq 4615

Description: The class of sets whose union is equal to a given class is included in the double power class of that class. (Contributed by BJ, 29-Apr-2021.)

Assertion

Ref	Expression
pwpwssunieq	|- { x | U. x = A } C_ ~P ~P A

Distinct variable group:   x, A

Proof of Theorem pwpwssunieq

Step	Hyp	Ref	Expression
1		eqimss 3657	. . 3 |- ( U. x = A -> U. x C_ A )
2	1	ss2abi 3674	. 2 |- { x | U. x = A } C_ { x | U. x C_ A }
3		pwpwab 4614	. 2 |- ~P ~P A = { x | U. x C_ A }
4	2, 3	sseqtr4i 3638	1 |- { x | U. x = A } C_ ~P ~P A

Syntax hints:   = wceq 1483   {cab 2608   C_ wss 3574   ~Pcpw 4158   U.cuni 4436

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-v 3202  df-in 3581  df-ss 3588  df-pw 4160  df-uni 4437

This theorem is referenced by:  toponsspwpw  20726  dmtopon  20727