If corporeal substance and extension were strictly identical, the notion of 'empty space' would be not merely false but conceptually incoherent, yet Descartes argues against the void on physical grounds, not purely definitional ones.

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Conceptually incoherent(as used in epistemology): An idea that doesn't make logical sense or contradicts itself when you think it through carefully.
Definitional grounds(as used in logic and philosophy): Reasons based purely on the meanings of words or concepts, rather than on how the world actually behaves.
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.
Physical grounds(as used in philosophy of science): Reasons or evidence based on how the natural world actually works, observed through experience and experiment.

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