2  Two sensible senses

Some of the legitimate uses of "identity" are worth considering in detail, because they are often, by a sort of pun, allowed to lend spurious plausibility to the bad ones.  It is therefore important to point out that they are not actually up to that job.

2.1  The logical senseIdentity in logic is the relation that, by ( Read more... )

In 1996 or thereabouts, for reasons I do not remember, I did some browsing in the Harvard library among books by & about Henri Poincaré, an important French mathematician of the late 19th & early 20th centuries.  He participated in the ferment that led to the theory of relativity, and there is a fringe literature that maintains that Einstein (or ( Read more... )