Four quadrant inverse tangent function.
Clock Hand Angle 1
Determine Whether an array is empty
Find a subset that divides the vector into equal halves
Determine the square root
Steepest Descent Method
Quasi-Newton Method for Unconstrained Minimization using BFGS Update
Partial pivoting for Gauss Elimination
Sequential Unconstrained Minimization (SUMT) using Exterior Penalty
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