Descartes' own princess Elisabeth objection demonstrates that distinct immaterial and material substances cannot coherently interact, making the 'clear' distinction pragmatically incoherent.

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Coherently(as describing how these functions work together): In a way that is logically consistent and doesn't contradict itself.
Descartes: # Descartes René Descartes was a French philosopher and mathematician from the 1600s who fundamentally changed how people think about knowledge and the mind. He's famous for the idea "I think, therefore I am" (cogito ergo sum), which means that the very fact that you can think proves you exist—a foundation for modern philosophy. He also invented the coordinate system used in mathematics (the x and y axes on a graph), which connects geometry and algebra in practical ways we still use today.
Princess Elisabeth(as the person who challenged Descartes' theory): A German princess and philosopher who corresponded with Descartes and raised a famous objection to his ideas—she questioned how two completely different things (mind and body) could possibly affect each other.
immaterial substance(The Platonic metaphysical argument for the soul's immateriality)

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