Conditions at an initial time 
from which a given set of mathematical equations or physical
system evolves. A system with initial conditions specified is known as an initial
value problem.
Initial Conditions
See also
Boundary Conditions, Initial Value ProblemExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Initial Conditions." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/InitialConditions.html