ContinuedFractionConvergentL function
Fully qualified name: Std.Math.ContinuedFractionConvergentL
function ContinuedFractionConvergentL(fraction : (BigInt, BigInt), denominatorBound : BigInt) : (BigInt, BigInt)
Summary
Finds the continued fraction convergent closest to fraction
with the denominator less or equal to denominatorBound
Using process similar to this: https://nrich.maths.org/1397