Theorem dmxpss2 5194

Description: Upper bound for the domain of a binary relation. (Contributed by BJ, 10-Jul-2022.)

Assertion

Ref	Expression
dmxpss2	⊢ (𝑅 ⊆ (𝐴 × 𝐵) → dom 𝑅 ⊆ 𝐴)

Proof of Theorem dmxpss2

Step	Hyp	Ref	Expression
1		dmss 4954	. 2 ⊢ (𝑅 ⊆ (𝐴 × 𝐵) → dom 𝑅 ⊆ dom (𝐴 × 𝐵))
2		dmxpss 5192	. 2 ⊢ dom (𝐴 × 𝐵) ⊆ 𝐴
3	1, 2	sstrdi 3249	1 ⊢ (𝑅 ⊆ (𝐴 × 𝐵) → dom 𝑅 ⊆ 𝐴)

Syntax hints:   → wi 4   ⊆ wss 3210   × cxp 4746  dom cdm 4748

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2814  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-br 4109  df-opab 4171  df-xp 4754  df-dm 4758

This theorem is referenced by:  cossxp2  5285