the.com/differential
The math of change itself — how fast, how much, how now.
means A rate of change or the gap between two values — how much one thing shifts relative to another, whether in price, speed, pressure, or position.
from From Latin 'differre' — to carry apart, to set apart — the same root that gives us 'differ' and 'defer.' Mathematicians in the 17th century, chasing the idea of infinitely small differences between quantities, borrowed the word for exactly that: the tiny gap between one value and the next instant's value. Leibniz and Newton built calculus on that sliver of difference, and the name stuck — carried from everyday 'being different' straight into the engine room of change itself.
- origin
- Leibniz named it for infinitesimal differences in the 1600s
- car part
- lets wheels spin at different speeds on turns
- calculus use
- dy measures the tangent line's rise, not the curve's
- diagnosis
- doctors list differential diagnoses to rank likely causes