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Theorem ltrel 8387
Description: 'Less than' is a relation. (Contributed by NM, 14-Oct-2005.)
Assertion
Ref Expression
ltrel Rel <

Proof of Theorem ltrel
StepHypRef Expression
1 ltrelxr 8386 . 2 < ⊆ (ℝ* × ℝ*)
2 relxp 4884 . 2 Rel (ℝ* × ℝ*)
3 relss 4862 . 2 ( < ⊆ (ℝ* × ℝ*) → (Rel (ℝ* × ℝ*) → Rel < ))
41, 2, 3mp2 16 1 Rel <
Colors of variables:    wff set class
This proof depends on syntax axioms:  wss 3220   × cxp 4772  Rel wrel 4779  *cxr 8359   < clt 8360
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-3an 1011  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-pr 3716  df-opab 4193  df-xp 4780  df-rel 4781  df-xr 8364  df-ltxr 8365
This theorem is used by: (None)
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