Welcome to my topology blog, one of my several math blogs. Thank you for visiting.

The blog has been in existence since 2009. Many thanks to all those who recommend or refer my blog to others, e.g. members of the math stack exchange community and other forums. This blog is a place for me to write about various topics in general topology (point-set topology). This blog is not intended as a research blog. The focus is usually on fairly basic topological notions – normal spaces, compact spaces, Lindelof property, metrizability, product spaces, and function spaces, just to name a few. I tend to write on topics or problems or examples that interest me. But there is a lot of contents in my blog that are geared toward readers taking courses in topology. So everyone should find something that interests him/her. I graduated from Auburn University with a PhD in mathematics.

Please also visit my website, which is an online hub for all my math contents.

2009 – 2017 Dan Ma

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Dear Mr. Ma,

I just wanted to let you know that I find your blog very enjoyable. Keep up the good work!

Hello Dan.

Keep up the good work on Topology.

Hello Dan, I really found the blog very interesting … keep the good work.

Hello Dan,

Keep on, it is a very useful BLOG for General Topology

Thanks Dan for making all the great posts!

Dan Ma’s site contains a lot of useful info!

Hi Dan!! I am giving a seminar talk in Japan next week, google C_p(X) and found your blog!!

Dear Dan Ma,

Could you tell me if the construction of Bernstein sets is possible in $\mathbb{R}^2$?

Thanks,

Mitch Voicoup

Of course you can do this in the plane. The argument is esentially the same as for the reals.

I really like your blog,very useful.

Hi Dan Ma

Your blog is indeed very useful and informative, specially your analysis and proofs of results.

Please could you attach a pdf format of your blogs (collective one, if possible), so that the readers can conveniently download and use them as Lecture notes or research notes.

Best regards

Liaqat Ali Khan

The entries on sequential spaces were super helpful 🙂 Thank you for your blog!

Dear Dan Ma,

I have been banging my head against this topological question for some time now (partly inspired by this blog!);

https://mathoverflow.net/questions/311203/sufficient-conditions-for-a-topological-space-to-be-regular-t-3/311547#comment777076_311547

Thought that I could as well drop the link here, if you have any time some time to give a look / any ideas.

Either way, keep blogging!

B.r. Matti Kiiski