Sigma Sky

write checks

Paid

A little bit of help for those learning how to write checks.

electrical engineering 1

Paid

This is a primer for undergraduate Electrical Engineering majors and provides reference for basic electrical engineering and related topics. The...

engineering economics

Paid

Engineering Economics is often required as an introductory course to Systems Engineering/ Industrial Engineering. In some curriculum, it is also...

Logic Op

Paid

Logic Op is a pocket reference for basic digital logic. Features include:+ Logic Gates: references and examples+ Boolean Logic: references and...