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What is a 'basic region' in calculus? My friend told me that a basic region is defined as a connected set in which the total boundary consists of a finite number of continuous curve of the form $y=f(x)$ or of the form $x=g(y)$. Is the above definition correct?

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As far as I am aware, "basic region" is not a standard mathematical term in reference to calculus.

However, in this economics text, we find the definition

"A basic region is a connected set in which the total boundary consists of a finite number of continuous arcs of the form $x_2=\phi(x_1),x_1=\psi(x_2)$."

Carefully note that this is not the same as what your friend said, and is actually not even close. It's easy to see that your friend's definition allows for self-intersecting curves, while this one does not. The difference between the "and" and the "or" here it critical.

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