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.
Dr. Robotnik as seen in Mario & Sonic at the Olympic Winter Games. In the English version of the games, Dr. Robotnik has was first voiced by Deem Bristow and until his death. Starting with Shadow The Hedgehog, he's been voiced by Mike Pollock.