Sandra Demontigny, a 46-year-old mother of three from Lévis, Que., was diagnosed with Alzheimer’s disease eight years ago. Her father had also had Alzheimer’s, his mind slipping until his eventual ...

A linear algebra program for the TI-84 Plus CE graphing calculator. Matrix automates the mechanical parts of linear algebra, such as computing determinants, row reductions, inverses, Cramer's rule, ...