However I seem to format my searches, either with or without brackets, the arithmetic seems to be ignored, eg:
{jrCore_list module="jrProfile" search1 = "profile_longitude < ($profile_longitude + 0.02)" limit="100" order_by = "_created desc"}
only returns values 'less than $profile_longitude', but not 'less than $profile_longitude + 0.02'.
updated by @iamtimbo: 03/23/15 12:52:03AM