Theorem infpwfidom 7337

Description: The collection of finite subsets of a set dominates the set. (We use the weaker sethood assumption ( ~P A i^i Fin ) e. _V because this theorem also implies that A is a set if ~P A i^i Fin is.) (Contributed by Mario Carneiro, 17-May-2015.)

Assertion

Ref	Expression
infpwfidom	|- ( ( ~P A i^i Fin ) e. _V -> A ~<_ ( ~P A i^i Fin ) )

Proof of Theorem infpwfidom

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

Step	Hyp	Ref	Expression
1		snelpwi 4273	. . 3 |- ( x e. A -> { x } e. ~P A )
2		snfig 6930	. . 3 |- ( x e. A -> { x } e. Fin )
3	1, 2	elind 3366	. 2 |- ( x e. A -> { x } e. ( ~P A i^i Fin ) )
4		sneqbg 3817	. . 3 |- ( x e. A -> ( { x } = { y } <-> x = y ) )
5	4	adantr 276	. 2 |- ( ( x e. A /\ y e. A ) -> ( { x } = { y } <-> x = y ) )
6	3, 5	dom2 6889	1 |- ( ( ~P A i^i Fin ) e. _V -> A ~<_ ( ~P A i^i Fin ) )

Syntax hints:   -> wi 4   <-> wb 105   = wceq 1373   e. wcel 2178   _Vcvv 2776   i^i cin 3173   ~Pcpw 3626   {csn 3643   class class class wbr 4059   ~<_ cdom 6849   Fincfn 6850

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-coll 4175  ax-sep 4178  ax-nul 4186  ax-pow 4234  ax-pr 4269  ax-un 4498

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-reu 2493  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-int 3900  df-iun 3943  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-suc 4436  df-iom 4657  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298  df-1o 6525  df-en 6851  df-dom 6852  df-fin 6853

This theorem is referenced by: (None)