The first blog post is usually some general introduction about the writer. I don’t like those posts so I start by testing my MathML installation.

To test it, let me try to write the “sombrero” function:

Error: https://dimitris.apeiro.gr/wp-content/plugins/wpmathpub/phpmathpublisher/img/ must have write access Read the official wpmathpub plugin FAQ for more details

which is automagically constructed by Ron Fredericks‘ WP Math Publisher plugin using this line of code:

[pmath size=12]z=sin (sqrt (x^2 + y^2)) / (sqrt (x^2 + y^2))[ /pmath]