On Mon, Aug 01, 2022 at 01:39:22PM +0200, Emanuel Berg wrote: [...] > Only a pair is a list as well ... But only in very restricted circumstances: when the pair's cdr is nil, i.e. when it is an one-element list. Otherwise it's an improper list... Unless, of course, you consider the list's head as "the list", in a pars pro toto way: then, a list is a pair whose cdr is a list. Or something. Cheers -- t