The Stackexchange links affirm the existence of interference for *relative* phase angles, but say nothing about different path lengths, which is the way I've previously thought of interference. So I remain confused on the subject of quantum interference and its relation to relative phase angles. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.