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Theorem tpnz 3708
Description: A triplet containing a set is not empty. (Contributed by NM, 10-Apr-1994.)
Hypothesis
Ref Expression
tpnz.1 𝐴 ∈ V
Assertion
Ref Expression
tpnz {𝐴, 𝐵, 𝐶} ≠ ∅

Proof of Theorem tpnz
StepHypRef Expression
1 tpnz.1 . . 3 𝐴 ∈ V
21tpid1 3694 . 2 𝐴 ∈ {𝐴, 𝐵, 𝐶}
3 ne0i 3421 . 2 (𝐴 ∈ {𝐴, 𝐵, 𝐶} → {𝐴, 𝐵, 𝐶} ≠ ∅)
42, 3ax-mp 5 1 {𝐴, 𝐵, 𝐶} ≠ ∅
Colors of variables: wff set class
Syntax hints:  wcel 2141  wne 2340  Vcvv 2730  c0 3414  {ctp 3585
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-3or 974  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-v 2732  df-dif 3123  df-un 3125  df-nul 3415  df-sn 3589  df-pr 3590  df-tp 3591
This theorem is referenced by: (None)
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