# Posts
- You've seen 100 species. How many exist?pub 2026-04-07rev 2026-09-20
A fingerprint reveals unseen probability mass, but support size and entropy need stronger assumptions.
- Regions for set inclusionpub 2026-04-03rev 2026-09-20
What boxes encode exactly, what Gumbel smoothing approximates, and where query geometries stop being closed.
- Why 561 passes Fermat's testpub 2024-12-17rev 2026-09-20
From Fermat pseudoprimes to Miller-Rabin, BPSW, and primality certificates.
- A difference table is a discrete derivativepub 2024-12-10rev 2026-09-20
Difference tables peel away polynomial growth one degree at a time, while their left edge rebuilds the sequence.
- Passive WiFi channel hopping as active sensingpub 2023-06-26rev 2026-09-20
Why packet-rate bandits do not by themselves solve transient-event discovery in passive WiFi monitoring.
- Common on the board, rare in Englishpub 2016-11-26rev 2026-09-20
Boggle board frequency is measurable; whether a word earns points also depends on scoring, recall, and opponents.
- Exact Bernoulli sampling from fair and biased coinspub 2015-08-15rev 2026-09-20
Fair bits can sample any target probability exactly; von Neumann's extractor removes an unknown fixed coin bias.