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Theorem 7re 8961
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 8942 . 2 7 = (6 + 1)
2 6re 8959 . . 3 6 ∈ ℝ
3 1re 7919 . . 3 1 ∈ ℝ
42, 3readdcli 7933 . 2 (6 + 1) ∈ ℝ
51, 4eqeltri 2243 1 7 ∈ ℝ
Colors of variables: wff set class
Syntax hints:  wcel 2141  (class class class)co 5853  cr 7773  1c1 7775   + caddc 7777  6c6 8933  7c7 8934
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 1440  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-4 1503  ax-17 1519  ax-ial 1527  ax-ext 2152  ax-1re 7868  ax-addrcl 7871
This theorem depends on definitions:  df-bi 116  df-cleq 2163  df-clel 2166  df-2 8937  df-3 8938  df-4 8939  df-5 8940  df-6 8941  df-7 8942
This theorem is referenced by:  7cn  8962  8re  8963  8pos  8981  5lt7  9063  4lt7  9064  3lt7  9065  2lt7  9066  1lt7  9067  7lt8  9068  6lt8  9069  7lt9  9076  6lt9  9077  7lt10  9475  6lt10  9476  lgsdir2lem1  13723
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