Theorem ss2abi 3228

Description: Inference of abstraction subclass from implication. (Contributed by NM, 31-Mar-1995.)

Hypothesis

Ref	Expression
ss2abi.1	⊢ (𝜑 → 𝜓)

Assertion

Ref	Expression
ss2abi	⊢ {𝑥 ∣ 𝜑} ⊆ {𝑥 ∣ 𝜓}

Proof of Theorem ss2abi

Step	Hyp	Ref	Expression
1		ss2ab 3224	. 2 ⊢ ({𝑥 ∣ 𝜑} ⊆ {𝑥 ∣ 𝜓} ↔ ∀𝑥(𝜑 → 𝜓))
2		ss2abi.1	. 2 ⊢ (𝜑 → 𝜓)
3	1, 2	mpgbir 1453	1 ⊢ {𝑥 ∣ 𝜑} ⊆ {𝑥 ∣ 𝜓}

Syntax hints:   → wi 4  {cab 2163   ⊆ wss 3130

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-in 3136  df-ss 3143

This theorem is referenced by:  abssi  3231  rabssab  3244  pwsnss  3804  iinuniss  3970  pwpwssunieq  3976  abssexg  4183  imassrn  4982  imadiflem  5296  imainlem  5298  fabexg  5404  f1oabexg  5474  tfrcllemssrecs  6353  mapex  6654  tgval  12711  tgvalex  12712