document.write( "Question 951796: Show that a subset C of a preordered space (X, ≤) is a chain if and only if
\n" ); document.write( "C × C ⊂ A ∪ A−1, where A := {(x, y) : x ≤ y}, A−1 := {(x, y) : (y, x) ∈ A} \n" ); document.write( "

Algebra.Com's Answer #581350 by mohjay(1) $\"\"$ $\"About$

You can put this solution on YOUR website!
\n" ); document.write( "

\n" );