Lever force F at a point "A" located by the coordinate vector r on the bar. The lever then exerts an output force F at the point "B" located by r. The rotation of the lever about the fulcrum "P" is defined by the rotation angle "θ" in radians. Let the coordinate vector of the point "P" that defines the fulcrum be r, and introduce the lengths which are the distances from the fulcrum to the input point "A" and to the output point "B", respectively. Now introduce the unit vectors e and e from the fulcrum to the point "A"
Jan Lever Jan Lever Jan Lever (Groningen, 20 July 1922 - Amsterdam, 23 November 2010) was a Dutch biologist specialized in zoology, endocrinology and evolutionary biology. His ideas on evolution may be characterized as a form of theistic evolution. The Reformed Lever studied biology at Utrecht University from 1939 onwards. Lever obtained his doctorate in 1950. He served as a professor of zoology at the Vrije Universiteit Amsterdam from 1952 until 1986. In his inaugural lecture, he presented his belief that evolution was the way in which God had created the world. He further developed this argument in his book "Creatie en