# What is the meaning of symmetric modulo?

So I was reading this: http://rjlipton.wordpress.com/2009/04/01/a-new-factoring-algorithm/

and found it saying "symmetic modulo"

So first off: what is " a -special matrix provided the following are true:" (refer to link)

-

"$A$ is symmetric modulo $n$" means that $A$ and $A^t$ are congruent modulo $n$.
does that mean that two numbers $a$ and $b$ are the same after a modulo operation by n? Ex. 23 and 19 are congruent mod 4. Is this what congruent means? Equal remainders after a modulo as I believe is defined here –  Eiyrioü von Kauyf Apr 8 '12 at 20:22