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gpassante

I am a retired mathematician. I consider Mathematics a real art. My fields of choice are Geometry, Analysis, and Number Theory. I am very interested in obtaining a rigorous, I would say almost Leibnizian, mathematical notation.

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2 Differentiability for $f:\Bbb R^2 \to \Bbb R$ defined by $f(x)=Ax\cdot x=x^\top \cdot Ax$ where $A\in M_{2\times 2}(\Bbb R)$ May 22 '20
2 The stereographic projection is bijective Nov 21 '20
1 Vector geometry proof (triangle) Dec 9 '20
1 Affine transformation matrix for conversion between line and rectangle Dec 23 '20
1 Show that convex hull can be represented as an intersection of half-spaces Jan 19
1 Show for the centroid $M$ of a triangle $ABC$ that $\vec{OM}=\frac13(\vec{OA}+\vec{OB}+\vec{OC})$ Feb 8
1 Understanding directional derivative in a example Sep 2 '20
1 Find the value of $x^5 + \frac{1}{x^5}$ - question about correctness of method Oct 24 '20
1 Why is the unit circle not homeomorphic to the closed unit disk? Oct 27 '20
1 Show if the following sets are open Oct 27 '20
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