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 Feb10 awarded Nice Answer Jan30 awarded Notable Question Dec20 awarded Caucus Dec20 awarded Constituent Oct25 awarded Tumbleweed Oct18 asked Finding Grassmann coefficients Oct1 awarded Yearling Sep24 awarded Autobiographer Jul22 awarded Good Answer Feb25 awarded Nice Question Nov17 awarded Popular Question Nov7 comment What are some examples of notation that really improved mathematics? @NateEldredge I think it is an improvement. Compare vector expressed as a series in usual notation $\sum \langle x,\phi \rangle \phi$ and in bra-ket notation $\sum \langle \phi | x \rangle |\phi\rangle$. The bra-ket notation also can be read not just as sum of vectors with coefficients but also as matrix-vector multiplication just by swapping things around. Also we can treat $\sum |\phi\rangle\langle\phi |$ as an identity and it gives rise to a bunch of useful algebraic manipulations. Nov7 answered What are some examples of notation that really improved mathematics? Nov7 comment What are some examples of notation that really improved mathematics? Einstein's notation is indeed the power of math at its finest! I would add Kronecker and Levi-Civita symbols to this answer. Nov7 awarded Nice Answer Nov7 comment How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? @kriss Thx, next to last was wrong indeed (also the second one), counting to five is hard! Fixed it and also colored the pens for more clearity. Nov7 revised How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? added 2 characters in body Nov7 answered How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen? Nov2 comment When written in decimal notation, every square number has at most 1000 digits that are not 0 or 1. True or false? [silly]$2^2 = 3.9999999...$ have clearly more than 1000 nines, so it's false[/silly] Oct1 awarded Yearling