Theorem ltrel 11183

Description: "Less than" is a relation. (Contributed by NM, 14-Oct-2005.)

Assertion

Ref	Expression
ltrel	⊢ Rel <

Proof of Theorem ltrel

Step	Hyp	Ref	Expression
1		ltrelxr 11182	. 2 ⊢ < ⊆ (ℝ* × ℝ*)
2		relxp 5639	. 2 ⊢ Rel (ℝ* × ℝ*)
3		relss 5728	. 2 ⊢ ( < ⊆ (ℝ* × ℝ*) → (Rel (ℝ* × ℝ*) → Rel < ))
4	1, 2, 3	mp2 9	1 ⊢ Rel <

Syntax hints:   ⊆ wss 3898   × cxp 5619  Rel wrel 5626  ℝ^*cxr 11154   < clt 11155

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2705

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-ex 1781  df-sb 2068  df-clab 2712  df-cleq 2725  df-clel 2808  df-v 3439  df-un 3903  df-ss 3915  df-pr 4580  df-opab 5158  df-xp 5627  df-rel 5628  df-xr 11159  df-ltxr 11160

This theorem is referenced by:  dflt2  13051  gtiso  32688