Mathematics Edu - Box style in #latex \documentclass{book} \usepackage{amsmath} \usepackage{cleveref} \usepackage[most]{tcolorbox} \newtcbtheorem[number within=chapter]{Theorem}{}{ enhanced, sharp corners, attach boxed title to top left={ xshift=-1mm ...
Proving Lemma 3.3 of L&S: Further Aspects of the Proof
Different proofs in amsmath with different QED symbol? - TeX - LaTeX Stack Exchange
Fancy boxes for theorem, lemma, and proof with mdframed – texblog