used to compare to specific variables? are you asking what sign you use to compare? if you are that would me <,>, and =, so lets say -1<7 you would put the arrow pointing to the one that is the smallest number, so if it was 6_3 you would put > in between sense 6 is larger then 3, so it would be 6>3, and then if something was equal like 6_7-1 you would do 6=7-1, understand?