Theorem prssd 3869

Description: Deduction version of prssi 3868: 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	⊢ (𝜑 → 𝐴 ∈ 𝐶)
prssd.2	⊢ (𝜑 → 𝐵 ∈ 𝐶)

Assertion

Ref	Expression
prssd	⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐶)

Proof of Theorem prssd

Step	Hyp	Ref	Expression
1		prssd.1	. 2 ⊢ (𝜑 → 𝐴 ∈ 𝐶)
2		prssd.2	. 2 ⊢ (𝜑 → 𝐵 ∈ 𝐶)
3		prssi 3868	. 2 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐶) → {𝐴, 𝐵} ⊆ 𝐶)
4	1, 2, 3	syl2anc 415	1 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐶)

Syntax hints:   → wi 4   ∈ wcel 2209   ⊆ wss 3220  {cpr 3706

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3711  df-pr 3712

This theorem is referenced by:  bassetsnn  13387  0idnsgd  13996  isnzr2  14464  lspprcl  14702  lsptpcl  14703  lspprss  14715  lspprid1  14720  perfectlem2  16028  upgr1edc  16276  uspgr1edc  16395  eupth2lemsfi  16633