 The last four examples in the above list are noteworthy, Bolzano claims, because the only invariable parts in them are logical concepts. He speaks of logical analyticity in such cases. Like Tarski after him, he comments that his definition of logical analyticity is not completely determinate, because the “domain of concepts belonging to logic is not circumscribed so sharply that controversies could not arise at times” (TS, § 148, no. 3; Tarski, 1983, 418–419).