### Notes from a math conference

May. 19th, 2013 06:51 pmA cyclic number is one that repeats, like 1/7 = .142857142857... [EDIT: according to the Wiki, this is wrong.]

1/7 has partial remainders in [1..6]

If 1/n remainders in [1..(n-1)], 1/n is cyclic

2/7, 3/7 in same cycle

Cyc gen by 7, 17, 19, 23, 47, 59, 61, 97 [EDIT: These numbers look prime, though some are missing like 11 and 31.]

Native command queueing (NCQ) reorders requests for disk sectors

Steven Moore testing drives

Western Digital lied about a drive having NCQ

4-dimensions

Complex functions: 2 inputs -> 2 outputs

Traditionally 2 planes are used.

Domain Couples, Image Complex

Color in image mapped to domain ? and vice versa

Poincaré disk: x^2 + y^2 < 1

"Neutral Postulates"

Hyperbolic distance different from Euclidean

Inversions in the circles preserves Eu dist?

Archimedes, Inc. Kaiser's math divsion.

Breast cancer rate dropped 10% since 2000. why? Environmental? Hormone pepl. therapy?

Survival analysis.

__Middle terms of binary primes__ left and right are 1, by definition.

Miller-Rabin test for primes.

A (+) B = min(A,B)

A (*) B = sum(A,B)

x^2 (+) 1 (*) x (+) 4 = min(2x, x+1, 4)