Fancy boxes for theorem, lemma, and proof with mdframed – texblog
theorems and definitions boxes (numbering should be chapter-wise) - LaTeX4technics
Jim Al-Khalili on Twitter: "I've recently discovered LaTeXiT. To celebrate here's Schrödinger's equation. You simply type in the LaTeX equation in lower box then click LaTEXiT and get it compiled as a
Copy/paste math equations into a LaTeX editor : MyScript Support
Boxed equations in LaTeX – The theoretician's corner