Resolve[expr]尝试把 expr 变成一种消除 ForAll 和 Exists 量词的形式.
Resolve[expr, dom]作用于域 dom. dom 常见的选择是 Complexes, Reals 和 Booleans.
证明单位圆盘非空:
找出二次方形在实数上为正数的条件:
找出二次方程式至少有两个不同的复数根的条件:
Reduce FindInstance Exists ForAll Conjunction Disjunction CylindricalDecomposition
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