I am a teacher of math (PhD in Mathematics) and a computer enthusiast (BEng in Electrical Engineering). I like using the pen name octaG.
A presentation, in Romanian, of the details needed to build the phase portrait (diagram of trajectories in the phase plane) for dynamical systems associated with two-dimensional linear systems of ordinary differential equations. Available on-line at bit.ly/sisteme2x2.
A presentation, in Romanian, of the source-code of (a fork of) the popular emulator Easy6502. Several commentaries are made about the source-code itself and about specifics regarding the 6502 microprocessor. It can be used as an auxiliary text for an introductory course on programming in assembly languages. Available on-line at bit.ly/easy6502cartea. One can try out the emulator at bit.ly/easy6502.
A presentation, in Romanian, of several important properties of ellipses (conical sections). The proofs are based on vector calculus. Available on-line at bit.ly/elipse2022.