The ideas of reason, of course, do not permit any deduction of the same kind as the categories; but if they are to have the least objective validity, even if it is only an indeterminate one, and are not to represent merely empty thought entities (entia rationis ratiocinantis),a then a deduction of them must definitely be possible, granted that it must also diverge quite far from the deduction one can carry out in the case of the categories.