While Googling something or other, I came across Nine Chapters on the Semigroup Art, which is a leisurely introduction to the theory of semigroups. (While the document is labelled “lecture notes”, the typography is quite beautiful.) Happy New Year!

This is the companion site for the book Grassmann Algebra: Exploring extended vector algebra with Mathematica and for the Mathematica-based software package GrassmannAlgebra

亘香通商はMathType, alsoft DiskWarrior（ディスクウォーリア）, Wolfram Mathematica, absoft ProFortran for Mac など有名ソフトウエアの正規代理店です。

mathStatica - Mathematical Statistics with Mathematica

Brady Kroupa San Francisco sun certified java developer programmer engineer jdk servlets JDBC, C++, jsp, SQL, Pascal, Apache, CVS, Source Safe, Flash, Vise, Mathematica, Windows 98, NT, Macintosh, Linux, UNIX

Wolfram, creators of the Wolfram Language, Wolfram|Alpha, Mathematica, Development Platform, Data Science Platform, Finance Platform, SystemModeler...