How to factor a quadratic
And more importantly, why it works.
Threeven Numbers
Thrice as nice as other math blogs
Dormant Last read · last published · next check
Read 7 days ago and current, but nothing has been published for 24 months.
Latest posts
The most natural way to measure a polygon. Kind of.
Here's a fun fact to throw out at parties: the formula for the circumference of a circle is exactly the derivative of the area.
24-puzzles
And how to use polynomials to study them
Differential equations
Like algebra, but with calculus.
Ordinals
Different shapes of infinity
Why calculus isn’t the pinnacle of mathematics
And why I feel a need to write an article with that title
Why 0.999... = 1
A brief foray into convergence of sequences of real numbers, and a proof that 0.999... is 1.
Divisibility tests
A brief overview of modular arithmetic as it relates to deriving digit-based tests for divisibility by prime numbers.
Coming soon
This is Threeven Numbers.