Theorem we0 4396

Description: Any relation is a well-ordering of the empty set. (Contributed by NM, 16-Mar-1997.)

Assertion

Ref	Expression
we0	|- R We (/)

Proof of Theorem we0

Dummy variables x y z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fr0 4386	. 2 |- R Fr (/)
2		ral0 3552	. 2 |- A. x e. (/) A. y e. (/) A. z e. (/) ( ( x R y /\ y R z ) -> x R z )
3		df-wetr 4369	. 2 |- ( R We (/) <-> ( R Fr (/) /\ A. x e. (/) A. y e. (/) A. z e. (/) ( ( x R y /\ y R z ) -> x R z ) ) )
4	1, 2, 3	mpbir2an 944	1 |- R We (/)

Syntax hints:   -> wi 4   /\ wa 104   A.wral 2475   (/)c0 3450   class class class wbr 4033   Fr wfr 4363   We wwe 4365

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 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-v 2765  df-dif 3159  df-in 3163  df-ss 3170  df-nul 3451  df-frfor 4366  df-frind 4367  df-wetr 4369

This theorem is referenced by: (None)