What's the proper way to end a mathematical proof? Is □ (blacksquare symbol) acceptable in place of 'QED'? - Quora
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 ...
![LyX --- QED symbol same as last line of the proof (instead of line below) - TeX - LaTeX Stack Exchange LyX --- QED symbol same as last line of the proof (instead of line below) - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/6Yalt.jpg)
LyX --- QED symbol same as last line of the proof (instead of line below) - TeX - LaTeX Stack Exchange
![Euler's Calculation of the Sum of the Reciprocals of the Squares: A Mini-Primary Source Project for Calculus 2 Students | Mathematical Association of America Euler's Calculation of the Sum of the Reciprocals of the Squares: A Mini-Primary Source Project for Calculus 2 Students | Mathematical Association of America](https://maa.org/sites/default/files/images/upload_library/46/Barnett_TRIUMPHS_MiniPSPs/Monks_EulersProofMiniPSP_ProofOutline.gif)