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Theorem difssd 3277
Description: A difference of two classes is contained in the minuend. Deduction form of difss 3276. (Contributed by David Moews, 1-May-2017.)
Assertion
Ref Expression
difssd (𝜑 → (𝐴𝐵) ⊆ 𝐴)

Proof of Theorem difssd
StepHypRef Expression
1 difss 3276 . 2 (𝐴𝐵) ⊆ 𝐴
21a1i 9 1 (𝜑 → (𝐴𝐵) ⊆ 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  cdif 3141  wss 3144
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-in1 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2171
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2176  df-cleq 2182  df-clel 2185  df-nfc 2321  df-v 2754  df-dif 3146  df-in 3150  df-ss 3157
This theorem is referenced by:  bj-charfun  15045  bj-charfundc  15046
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