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Theorem 7re 8997
Description: The number 7 is real. (Contributed by NM, 27-May-1999.)
Assertion
Ref Expression
7re 7 ∈ ℝ

Proof of Theorem 7re
StepHypRef Expression
1 df-7 8978 . 2 7 = (6 + 1)
2 6re 8995 . . 3 6 ∈ ℝ
3 1re 7952 . . 3 1 ∈ ℝ
42, 3readdcli 7966 . 2 (6 + 1) ∈ ℝ
51, 4eqeltri 2250 1 7 ∈ ℝ
Colors of variables: wff set class
Syntax hints:  wcel 2148  (class class class)co 5871  cr 7806  1c1 7808   + caddc 7810  6c6 8969  7c7 8970
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-5 1447  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-4 1510  ax-17 1526  ax-ial 1534  ax-ext 2159  ax-1re 7901  ax-addrcl 7904
This theorem depends on definitions:  df-bi 117  df-cleq 2170  df-clel 2173  df-2 8973  df-3 8974  df-4 8975  df-5 8976  df-6 8977  df-7 8978
This theorem is referenced by:  7cn  8998  8re  8999  8pos  9017  5lt7  9099  4lt7  9100  3lt7  9101  2lt7  9102  1lt7  9103  7lt8  9104  6lt8  9105  7lt9  9112  6lt9  9113  7lt10  9511  6lt10  9512  lgsdir2lem1  14291
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