Description: Ordering on reals is transitive. Axiom 19 of 22 for real and complex
numbers, derived from ZF set theory. Note: The more general version
for extended reals is axlttrn . This construction-dependent theorem
should not be referenced directly; instead, use ax-pre-lttrn .
(Contributed by NM, 19-May-1996)(Revised by Mario Carneiro, 16-Jun-2013)(New usage is discouraged.)