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Theorem tr0 2052
Description: The empty set is transitive.
Assertion
Ref Expression
tr0 Tr ∅

Proof of Theorem tr0
StepHypRef Expression
1 0ss 1725 . 2 ∅ ⊆ ℘∅
2 dftr4 2046 . 2 (Tr ∅ ↔ ∅ ⊆ ℘∅)
31, 2mpbir 165 1 Tr ∅
Colors of variables: wff set class
Syntax hints:   ⊆ wss 1487  ∅c0 1707  ℘cpw 1798  Tr wtr 2041
This theorem is referenced by:  ord0 2276  r1tr 3498
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-16 922  ax-17 925  ax-ext 1074
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-v 1349  df-dif 1489  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-uni 1920  df-tr 2042
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