Theorem prssd 3777

Description: Deduction version of prssi 3776: A pair of elements of a class is a subset of the class. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

Hypotheses

Ref	Expression
prssd.1	|- ( ph -> A e. C )
prssd.2	|- ( ph -> B e. C )

Assertion

Ref	Expression
prssd	|- ( ph -> { A , B } C_ C )

Proof of Theorem prssd

Step	Hyp	Ref	Expression
1		prssd.1	. 2 |- ( ph -> A e. C )
2		prssd.2	. 2 |- ( ph -> B e. C )
3		prssi 3776	. 2 |- ( ( A e. C /\ B e. C ) -> { A , B } C_ C )
4	1, 2, 3	syl2anc 411	1 |- ( ph -> { A , B } C_ C )

Syntax hints:   -> wi 4   e. wcel 2164   C_ wss 3153   {cpr 3619

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-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2175

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-sn 3624  df-pr 3625

This theorem is referenced by:  0idnsgd  13275  isnzr2  13664  lspprcl  13873  lsptpcl  13874  lspprss  13886  lspprid1  13891