Theorem 7re 8122

Description: The number 7 is real. (Contributed by NM, 27-May-1999.)

Assertion

Ref	Expression
7re	|- 7 e. RR

Proof of Theorem 7re

Step	Hyp	Ref	Expression
1		df-7 8103	. 2 |- 7 = ( 6 + 1 )
2		6re 8120	. . 3 |- 6 e. RR
3		1re 7118	. . 3 |- 1 e. RR
4	2, 3	readdcli 7132	. 2 |- ( 6 + 1 ) e. RR
5	1, 4	eqeltri 2151	1 |- 7 e. RR

Syntax hints:   e. wcel 1433  (class class class)co 5532   RRcr 6980   1c1 6982   + caddc 6984   6c6 8093   7c7 8094

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-4 1440  ax-17 1459  ax-ial 1467  ax-ext 2063  ax-1re 7070  ax-addrcl 7073

This theorem depends on definitions:  df-bi 115  df-cleq 2074  df-clel 2077  df-2 8098  df-3 8099  df-4 8100  df-5 8101  df-6 8102  df-7 8103

This theorem is referenced by:  7cn  8123  8re  8124  8pos  8142  5lt7  8217  4lt7  8218  3lt7  8219  2lt7  8220  1lt7  8221  7lt8  8222  6lt8  8223  7lt9  8230  6lt9  8231  7lt10  8609  6lt10  8610