In mathematical induction, showing that something works for the first case, or that P1 is true. angle of depression. The angle formed by a horizontal line and an observer's line of sight to an object below. angle of elevation. The angle formed by a horizontal line and an observer's line of sight to an object above.
Plankton's voice is provided by American actor Mr. Lawrence. The voice Lawrence uses for Plankton originated as an imitation of one of his deep-voiced friends from high school. On television, he first used the voice for incidental characters on Rocko's Modern Life.
Karen's voice is provided by American actress Jill Talley, who is also the wife of SpongeBob's voice actor, Tom Kenny. Talley uses a Midwestern accent for the character. Whenever Karen talks, electronic sound effects are underlaid by the series' audio engineers to create a robotic sound.