The above is the letter presenting the resignation of the editorial board of Topology, an Elsevier journal. The journal has been discontinued as of this year.

[…] As you are well aware, the Editors have been concerned about the price of Topology since Elsevier gained control of the journal in 1994. […] The journal Topology has an illustrious history with which we, on becoming editors, were extremely proud to be associated. […] However, we feel that Elsevier’s policies towards the publication of mathematics research have undermined this legacy.

Therefore, with great reluctance and sadness, we have made the difficult decision to resign. […]

On Google+, David Roberts gave a link to the journal’s site, with some highlights: As you can see here, the last published issue (vol. 48, 2-4) was June-December 2009. The previous issue was 40 pages and consisted of 2 papers (that you can purchase access to, at $31.50 each. Plus tax.) And there is also a supplement, published on December 2011. Only $31.50 (plus tax) for a 4 page correction.

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Yes. This is a consequence of the Davis-Matiyasevich-Putnam-Robinson work on Hilbert's 10th problem, and some standard number theory. A number of papers have details of the $\Pi^0_1$ sentence. To begin with, take a look at the relevant paper in Mathematical developments arising from Hilbert's problems (Proc. Sympos. Pure Math., Northern Illinois Un […]

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Let $C$ be the standard Cantor middle-third set. As a consequence of the Baire category theorem, there are numbers $r$ such that $C+r$ consists solely of irrational numbers, see here. What would be an explicit example of a number $r$ with this property? Short of an explicit example, are there any references addressing this question? A natural approach would […]

Not necessarily. That $\mathfrak m$ is consistently singular is proved in MR0947850 (89m:03045) Kunen, Kenneth. Where $\mathsf{MA}$ first fails. J. Symbolic Logic 53(2), (1988), 429–433. There, Ken shows that $\mathfrak{m}$ can be singular of cofinality $\omega_1$. (Both links above are behind paywalls.)

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[…] E. Caicedo: A letter (on the resignation of the editorial board of […]