bounadry conditions in field theory

These are used to get a closed form solution to Maxwell's Equations. You know the field, potential, and current at certain points in space.

As an aside, maxwell started out with about 20 equations in his notebook and Heaviside and a few others threw out the ones with errors and consolidated the duplicates in different forms. many things in science and engineering are credited to the wrong person. The Smith Chart was published by a Japanese engineer in Japan 13 months before Smith did it in the US. The Gilbert Mixer was around in the days of valves/tubes.

do you want it in a nutshell or the whole packcage ?

anything as u like.but i must make me to understand
( tangenatial and normal component of D,B,H
D1=D2,B1=B2,H1=H2)