Calculus, Geometry, algebra, statistics, combinatorics, (advanced) engineering mathematics, number theory, analytical geometry,trigonometry,... + also I am expert at solving electrical engineering problems in electromagnetics , electrical circuits, signals and systems...
Sepehr Ashtari's Problem Solving Skills:
I am expert at mathematics problems and electrical engineering- telecommunication
Sepehr Ashtari's Problem Solving Experience:
I designed some telecommunications antennas (biconical, gps choke ring,LPDA) in my uni field + designed and built a jammer circuit and some RF board (Wilkinson power divider, lna circuit for gps, PA circuits ) + designed distributed amplifier in ADS software and etc.