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Theorem 7re 8940
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 8921 . 2 7 = (6 + 1)
2 6re 8938 . . 3 6 ∈ ℝ
3 1re 7898 . . 3 1 ∈ ℝ
42, 3readdcli 7912 . 2 (6 + 1) ∈ ℝ
51, 4eqeltri 2239 1 7 ∈ ℝ
Colors of variables: wff set class
Syntax hints:  wcel 2136  (class class class)co 5842  cr 7752  1c1 7754   + caddc 7756  6c6 8912  7c7 8913
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1435  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-4 1498  ax-17 1514  ax-ial 1522  ax-ext 2147  ax-1re 7847  ax-addrcl 7850
This theorem depends on definitions:  df-bi 116  df-cleq 2158  df-clel 2161  df-2 8916  df-3 8917  df-4 8918  df-5 8919  df-6 8920  df-7 8921
This theorem is referenced by:  7cn  8941  8re  8942  8pos  8960  5lt7  9042  4lt7  9043  3lt7  9044  2lt7  9045  1lt7  9046  7lt8  9047  6lt8  9048  7lt9  9055  6lt9  9056  7lt10  9454  6lt10  9455  lgsdir2lem1  13569
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