But math, algebra, trig, calculus all build upon the same foundational principles.
Double predestination and free will are two different and contradictory foundations.
Maybe they are, maybe they’re not. We can only understand what God has graciously revealed to us. And what you may have understood at 6 years old is not necessarily what Albert Einstein understood about math at 6 yrs old, and you would have been very foolish to insist that he did