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Meyer, Ruth A.; Riley, James E. – School Science and Mathematics, 1989
Presents a method for using matrix algebra and computers to encode and decode secret messages. Provides examples of coding procedures, a short review of matrix multiplication, and a BASIC program for use with secret messages containing up to 1000 numbers. (RT)
Descriptors: Algebra, Computer Software, Computer Uses in Education, Mathematical Enrichment

Schaefer, Paul – Journal of Computers in Mathematics and Science Teaching, 1989
Provides a program listing in True BASIC which constructs several kinds of matrices: (1) matrices with integral entries that have inverses that have integral entries; (2) matrices with integral entries that have inverses that are rational numbers with reasonable denominators; and (3) matrices with integral entries and prescribed integer…
Descriptors: Algebra, College Mathematics, Computer Oriented Programs, Computer Software