Theorem ltrelsr 7822

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

Assertion

Ref	Expression
ltrelsr	⊢ <R ⊆ (R × R)

Proof of Theorem ltrelsr

Dummy variables 𝑥 𝑦 𝑧 𝑤 𝑣 𝑢 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-ltr 7814	. 2 ⊢ <R = {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ R ∧ 𝑦 ∈ R) ∧ ∃𝑧∃𝑤∃𝑣∃𝑢((𝑥 = [⟨𝑧, 𝑤⟩] ~R ∧ 𝑦 = [⟨𝑣, 𝑢⟩] ~R ) ∧ (𝑧 +P 𝑢)<P (𝑤 +P 𝑣)))}
2		opabssxp 4738	. 2 ⊢ {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ R ∧ 𝑦 ∈ R) ∧ ∃𝑧∃𝑤∃𝑣∃𝑢((𝑥 = [⟨𝑧, 𝑤⟩] ~R ∧ 𝑦 = [⟨𝑣, 𝑢⟩] ~R ) ∧ (𝑧 +P 𝑢)<P (𝑤 +P 𝑣)))} ⊆ (R × R)
3	1, 2	eqsstri 3216	1 ⊢ <R ⊆ (R × R)

Syntax hints:   ∧ wa 104   = wceq 1364  ∃wex 1506   ∈ wcel 2167   ⊆ wss 3157  ⟨cop 3626   class class class wbr 4034  {copab 4094   × cxp 4662  (class class class)co 5925  [cec 6599   +_P cpp 7377  <_P cltp 7379   ~_R cer 7380  Rcnr 7381   <_R cltr 7387

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-in 3163  df-ss 3170  df-opab 4096  df-xp 4670  df-ltr 7814

This theorem is referenced by:  gt0srpr  7832  recexgt0sr  7857  addgt0sr  7859  mulgt0sr  7862  caucvgsrlemcl  7873  caucvgsrlemasr  7874  caucvgsrlemfv  7875  map2psrprg  7889  suplocsrlemb  7890  suplocsrlempr  7891  suplocsrlem  7892  suplocsr  7893  ltresr  7923  axpre-ltirr  7966  axpre-lttrn  7968