Epsilon-delta intuition without terror
What the quantifiers in the limit definition are asking you to guarantee.
Explainers
Long-form, original introductions to sticky ideas in higher mathematics. Each piece includes outbound citations and links into topics, pathways, and the glossary.
What a derivative actually measures
Instantaneous rate, linear approximation, and units that tell a story.
Eigenvalues in plain language
Stretch factors along directions a linear map refuses to tip.
Bayes’ theorem without the fog
Updating beliefs with evidence using counts you can picture.
Sequences, series, and when infinite sums make sense
Partial sums, convergence tests in spirit, and common traps.
Separable differential equations walkthrough
Separate, integrate, check lost solutions, interpret the answer.