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Theorem ressxr 8369
Description: The standard reals are a subset of the extended reals. (Contributed by NM, 14-Oct-2005.)
Assertion
Ref Expression
ressxr ℝ ⊆ ℝ*

Proof of Theorem ressxr
StepHypRef Expression
1 ssun1 3392 . 2 ℝ ⊆ (ℝ ∪ {+∞, -∞})
2 df-xr 8364 . 2 * = (ℝ ∪ {+∞, -∞})
31, 2sseqtrri 3283 1 ℝ ⊆ ℝ*
Colors of variables:    wff set class
This proof depends on syntax axioms:  cun 3218  wss 3220  {cpr 3710  cr 8178  +∞cpnf 8357  -∞cmnf 8358  *cxr 8359
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-xr 8364
This theorem is used by:  rexpssxrxp  8370  rexr  8371  0xr  8372  rexrd  8375  ltrelxr  8386  iooval2  10317  fzval2  10414  seq3coll  11294  summodclem2a  12148  prodmodclem2a  12343  ismet2  15455  qtopbas  15623  tgqioo  15656
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