One group named for this man is a six-dimensional non-compact Lie group represented as SO(1,3) ["S
 O of one comma three"] With a Danish physicist, this man independently discovered a relation between
 temperature and index of refraction. This scientist noted that an observer of an object traveling near the
 speed of light would see its length contract, an effect he names with Fitzgerald. This man's factor is
 proportional to the square root of one minus the square of the relative velocity divided by the square of the
 speed of light. For 10 points, name this Dutch phy
One group named for this man is a six-dimensional non-compact Lie group represented as SO(1,3) ["S
 O of one comma three"] With a Danish physicist, this man independently discovered a relation between
 temperature and index of refraction. This scientist noted that an observer of an object traveling near the
 speed of light would see its length contract, an effect he names with Fitzgerald. This man's factor is
 proportional to the square root of one minus the square of the relative velocity divided by the square of the
 speed of light. For 10 points, name this Dutch physicist who developed a transform used for observations in
 special relativity and names the magnetic force felt by a moving charge.
One group named for this man is a six-dimensional non-compact Lie group represented as SO(1,3)
Hendrik {Lorentz}