Theorem trv 2053

Description: The universe is transitive.

Assertion

Ref	Expression
trv	⊢ Tr V

Proof of Theorem trv

Step	Hyp	Ref	Expression
1		ssv 1520	. 2 ⊢ ∪V ⊆ V
2		df-tr 2042	. 2 ⊢ (Tr V ↔ ∪V ⊆ V)
3	1, 2	mpbir 165	1 ⊢ Tr V

Syntax hints:  Vcvv 1348   ⊆ wss 1487  ∪cuni 1919  Tr wtr 2041

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-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-in 1491  df-ss 1492  df-tr 2042

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