## “Send me your rotation

let's focus on good definitions...” Today, I'll explore a seemingly simple question: what is a rotation? I'm asking for the definition of a rotation, which »

let's focus on good definitions...” Today, I'll explore a seemingly simple question: what is a rotation? I'm asking for the definition of a rotation, which »

On the last post, I gave a naive idea of where the Jacobian determinant comes from when changing variables: it was the volume of an approximate »

Years ago I used the Jacobian determinant to find the area of an astroid and made a note about finding out where it came from. There »

In the beginning, there was nothing, \( 0 = \emptyset \). Then we realized it was something, \( 1 = \{ \emptyset \} \). Then we wondered, why not have another thing? \(2\). And »