Theorem limuni2 4428

Description: The union of a limit ordinal is a limit ordinal. (Contributed by NM, 19-Sep-2006.)

Assertion

Ref	Expression
limuni2	|- ( Lim A -> Lim U. A )

Proof of Theorem limuni2

Step	Hyp	Ref	Expression
1		limuni 4427	. . 3 |- ( Lim A -> A = U. A )
2		limeq 4408	. . 3 |- ( A = U. A -> ( Lim A <-> Lim U. A ) )
3	1, 2	syl 14	. 2 |- ( Lim A -> ( Lim A <-> Lim U. A ) )
4	3	ibi 176	1 |- ( Lim A -> Lim U. A )

Syntax hints:   -> wi 4   <-> wb 105   = wceq 1364   U.cuni 3835   Lim wlim 4395

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-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 2175

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-in 3159  df-ss 3166  df-uni 3836  df-tr 4128  df-iord 4397  df-ilim 4400

This theorem is referenced by: (None)