As previously mentioned, I am learning category theory, beginning with Lawvere's Conceptual Mathematics book. This is a very elementry book that assumes almost nothing as a background. However, it is still a math book, which requires doing some exercises. Since the book provides no answer to exercises, I decide …

Perhaps due to my rather small brain (literally), I dislike remembering tedious details. When in elementary school, I hated reciting classic Chinese poems, but liked composing my own :-).  In high school, I hated chemistry but loved physics, because one could do everything based on a few principles in physics, whereas …

MathJax seems to be the emerging standard for displaying math on the Web at this moment. It is supported by American Mathematical Society and American Physical Society, and has already been adopted by major math related discussion venues such as Physics Forums and Stack Exchange. MathJax displays math using CSS …