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Theorem ltrelpi 7691
Description: Positive integer 'less than' is a relation on positive integers. (Contributed by NM, 8-Feb-1996.)
Assertion
Ref Expression
ltrelpi <N ⊆ (N × N)

Proof of Theorem ltrelpi
StepHypRef Expression
1 df-lti 7674 . 2 <N = ( E ∩ (N × N))
2 inss2 3452 . 2 ( E ∩ (N × N)) ⊆ (N × N)
31, 2eqsstri 3280 1 <N ⊆ (N × N)
Colors of variables:    wff set class
This proof depends on syntax axioms:  cin 3219  wss 3220   E cep 4432   × cxp 4772  Ncnpi 7639   <N clti 7642
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-in 3226  df-ss 3233  df-lti 7674
This theorem is used by:  ltsonq  7765  caucvgprlemk  8032  caucvgprlem1  8046  caucvgprlem2  8047  caucvgprprlemk  8050  caucvgprprlemval  8055  caucvgprprlem1  8076  caucvgprprlem2  8077  ltrenn  8222
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