Theorem unissd 3911

Description: Subclass relationship for subclass union. Deduction form of uniss 3908. (Contributed by David Moews, 1-May-2017.)

Hypothesis

Ref	Expression
unissd.1	⊢ (𝜑 → 𝐴 ⊆ 𝐵)

Assertion

Ref	Expression
unissd	⊢ (𝜑 → ∪ 𝐴 ⊆ ∪ 𝐵)

Proof of Theorem unissd

Step	Hyp	Ref	Expression
1		unissd.1	. 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵)
2		uniss 3908	. 2 ⊢ (𝐴 ⊆ 𝐵 → ∪ 𝐴 ⊆ ∪ 𝐵)
3	1, 2	syl 14	1 ⊢ (𝜑 → ∪ 𝐴 ⊆ ∪ 𝐵)

Syntax hints:   → wi 4   ⊆ wss 3197  ∪ cuni 3887

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211

This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2801  df-in 3203  df-ss 3210  df-uni 3888

This theorem is referenced by:  iotanul  5293  tfrlemibfn  6472  tfrlemiubacc  6474  tfr1onlemssrecs  6483  tfr1onlembfn  6488  tfr1onlemubacc  6490  tfrcllemssrecs  6496  tfrcllembfn  6501  tfrcllemubacc  6503  fiuni  7141  eltg3i  14724  unitg  14730  tgss  14731  ntrss  14787