The Pizza Theorem states that if a pizza is divided by straight cuts (radii of the pizza) through a common point (not necessarily the center), and the number of cuts is a multiple of four (4, 8, 12, etc.), then it is possible to divide the pizza into equal-area slices among two people, with each person receiving alternate slices.
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Here's a nice "proof without words":
The sum of the squares of several positive values can never be bigger than the square of their sum.
This picture helps make sense of how ℓ₁ and ℓ₂ norms regularize and sparsify solutions (resp.). [1/n]
The symbol for pi (π) was first used by William Jones, a Welsh mathematician, in 1706. In his work titled "Synopsis Palmariorum Matheseos", Jones needed a concise way to represent the ratio of a circle's circumference to its diameter, which was already known to be a constant.