Theorem ltrelpr 7872

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 7837	. 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 7647  Pcnp 7658  <_P cltp 7662

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 7837

This theorem is used by:  ltprordil  7956  ltexprlemm  7967  ltexprlemopl  7968  ltexprlemlol  7969  ltexprlemopu  7970  ltexprlemupu  7971  ltexprlemdisj  7973  ltexprlemloc  7974  ltexprlemfl  7976  ltexprlemrl  7977  ltexprlemfu  7978  ltexprlemru  7979  ltexpri  7980  lteupri  7984  ltaprlem  7985  prplnqu  7987  caucvgprprlemk  8050  caucvgprprlemnkltj  8056  caucvgprprlemnkeqj  8057  caucvgprprlemnjltk  8058  caucvgprprlemnbj  8060  caucvgprprlemml  8061  caucvgprprlemlol  8065  caucvgprprlemupu  8067  suplocexprlemss  8082  suplocexprlemlub  8091  gt0srpr  8115  lttrsr  8129  ltposr  8130  archsr  8149