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Theorem 7re 8803
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 8784 . 2 7 = (6 + 1)
2 6re 8801 . . 3 6 ∈ ℝ
3 1re 7765 . . 3 1 ∈ ℝ
42, 3readdcli 7779 . 2 (6 + 1) ∈ ℝ
51, 4eqeltri 2212 1 7 ∈ ℝ
Colors of variables: wff set class
Syntax hints:  wcel 1480  (class class class)co 5774  cr 7619  1c1 7621   + caddc 7623  6c6 8775  7c7 8776
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 1423  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-4 1487  ax-17 1506  ax-ial 1514  ax-ext 2121  ax-1re 7714  ax-addrcl 7717
This theorem depends on definitions:  df-bi 116  df-cleq 2132  df-clel 2135  df-2 8779  df-3 8780  df-4 8781  df-5 8782  df-6 8783  df-7 8784
This theorem is referenced by:  7cn  8804  8re  8805  8pos  8823  5lt7  8905  4lt7  8906  3lt7  8907  2lt7  8908  1lt7  8909  7lt8  8910  6lt8  8911  7lt9  8918  6lt9  8919  7lt10  9314  6lt10  9315
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