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Theorem difssd 3071
Description: A difference of two classes is contained in the minuend. Deduction form of difss 3070. (Contributed by David Moews, 1-May-2017.)
Assertion
Ref Expression
difssd (𝜑 → (𝐴𝐵) ⊆ 𝐴)

Proof of Theorem difssd
StepHypRef Expression
1 difss 3070 . 2 (𝐴𝐵) ⊆ 𝐴
21a1i 9 1 (𝜑 → (𝐴𝐵) ⊆ 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  cdif 2914  wss 2917
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-dif 2920  df-in 2924  df-ss 2931
This theorem is referenced by: (None)
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