Theorem ltrelpr 7873

Description: Positive real 'less than' is a relation on positive reals. (Contributed by NM, 14-Feb-1996.)

Assertion

Ref	Expression
ltrelpr	⊢ <P ⊆ (P × P)

Proof of Theorem ltrelpr

Dummy variables 𝑥 𝑞 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-iltp 7838	. 2 ⊢ <P = {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ ∃𝑞 ∈ Q (𝑞 ∈ (2nd ‘𝑥) ∧ 𝑞 ∈ (1st ‘𝑦)))}
2		opabssxp 4849	. 2 ⊢ {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ ∃𝑞 ∈ Q (𝑞 ∈ (2nd ‘𝑥) ∧ 𝑞 ∈ (1st ‘𝑦)))} ⊆ (P × P)
3	1, 2	eqsstri 3280	1 ⊢ <P ⊆ (P × P)

This proof depends on syntax axioms:   ∧ wa 104   ∈ wcel 2209  ∃wrex 2529   ⊆ wss 3220  {copab 4191   × cxp 4772  ‘cfv 5377  1^st c1st 6372  2^nd c2nd 6373  Qcnq 7648  Pcnp 7659  <_P cltp 7663

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-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-in 3226  df-ss 3233  df-opab 4193  df-xp 4780  df-iltp 7838

This theorem is used by:  ltprordil  7957  ltexprlemm  7968  ltexprlemopl  7969  ltexprlemlol  7970  ltexprlemopu  7971  ltexprlemupu  7972  ltexprlemdisj  7974  ltexprlemloc  7975  ltexprlemfl  7977  ltexprlemrl  7978  ltexprlemfu  7979  ltexprlemru  7980  ltexpri  7981  lteupri  7985  ltaprlem  7986  prplnqu  7988  caucvgprprlemk  8051  caucvgprprlemnkltj  8057  caucvgprprlemnkeqj  8058  caucvgprprlemnjltk  8059  caucvgprprlemnbj  8061  caucvgprprlemml  8062  caucvgprprlemlol  8066  caucvgprprlemupu  8068  suplocexprlemss  8083  suplocexprlemlub  8092  gt0srpr  8116  lttrsr  8130  ltposr  8131  archsr  8150