Simultaneity is the property of two events happening at the same time.
 In mathematics, a system of equations or a set of simultaneous equations share variables; a solution is a set of variable values for which all these equations are satisfied simultaneously.
 In modern physics two events may be simultaneous with respect to a time event as follows:
A central event (0,0) is used to anchor a spacetime plane {(x,t) in RxR} = ST where x measures distance in units of 30 centimeters and t measures time in nanoseconds. Space events satisfy x > t and the time events satisfy x < t. Now a space event e is simultaneous with the origin (0,0), with respect to a time event z, if e and z are hyperbolicorthogonal points in ST. Two events g and h in ST are simultaneous with respect to z if their difference g  h in ST is hyperbolicorthogonal to z.
See also
External links

Simultaneity in Music by Robert Iolini. Extract from a Master of Arts thesis entitled Simultaneity in Music. Macquarie University. Sydney. Australia. February 1998.
Last updated: 06022005 13:46:57