Tag Archives: Algebraic geometry

What is an Infinitesimal?

Posted on August 28, 2019 by Sarah K. Salmon

A guest post from Reginald Anderson at Kansas State University. First-time learners of calculus often struggle with the notion of an infinitesimal, and considering $\frac{dy}{dx}$ literally as a fraction can lead students astray in Calculus III and differential equations, when … Continue reading →

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A Pretty Lemma About Prime Ideals and Products of Ideals

Posted on August 23, 2017 by Tom Gannon

I was trying to prove a theorem in algebraic geometry which basically held if and only if this lemma held. Here’s the lemma: Lemma: Given any ring $A$, a prime ideal $ \mathfrak{p} \subset A$, and a finite collection of ideals … Continue reading →

Posted in Algebra, Algebraic Geometry, Math | Tagged , , | 3 Comments