I’ve defined (well, vaguely defined) what I call “meta-singular numbers”. These can be used to describe values of a function in a singularity. See this PlanetMath article.
read moreI have finished checking my book “Algebraic General Topology. Volume 1” for errors. That said some minor errors may yet remain, probably I will check it again. At the time of writing this blog post the book is available online. Enjoy this…
read moreI’ve sent my book (Algebraic General Topology. Volume 1) to a publisher. Afterward I’ve withdrawn it due an error. This was a fake alarm: I’ve found an error where there was no error. Today I’ve submitted it to the publisher again. Now…
read moreBackground information: I’ve written a math book and submitted it to a publisher. But afterward I found a serious error (a wrong proof of the conjecture below) and have withdrawn it from the publisher. Now the draft book is available online. (You…
read moreI found a serious error in my book. The error is in the proof of the lemma currently numbered 15.140. I for now was unable to write a correct proof of this lemma (nor of some appropriate weakening of this lemma). So…
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