A personal Substack by mathematician Senia Sheydvasser explaining mathematical ideas and their applications, from linear algebra and machine learning to induction and proof technique. Readers get clear, concrete explanations that connect abstract theory to real uses such as PageRank and error-correcting codes.

Evidence-first long-form investigations connecting physics, AI, mathematics and complex systems, including original empirical checks such as probing government servers for post-quantum encryption support. Readers get historically grounded conceptual essays and data-driven analysis of how verification, memory and security work in practice.

Essays and lecture posts on the mathematics and philosophy of the infinite, covering topics such as set theory, paradoxes of infinity, ordinal definability and the logic of chess. Material is drawn from the author's book and ongoing research papers.

Technical deep dives into cryptography, post-quantum algorithms and machine learning, often with runnable code on GitHub. The author explains the underlying math and challenges common misconceptions, such as what 'provably secure' really means.