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Posted on Saturday, 3 September 2011

Angle = Volume

This is trippy, and profound.

The determinant — which tells you the change in size after a matrix transformation 𝓜 — is just an Instance of the Alternating Multilinear Map.

(Alternating meaning it goes + − + − + − + − ……. Multilinear meaning linear in every term, ceteris paribus:

\begin{matrix} a \; f(\cdots \blacksquare \cdots) + b \; f( \cdots \blacksquare \cdots) \\ = \shortparallel | \ | \\ f( \cdots a \ \blacksquare + b \ \blacksquare \cdots) \end{matrix} \\ \\ \qquad \footnotesize{\bullet f \text{ is the multilinear mapping}} \\ \qquad \bullet a, b \in \text{the underlying number corpus } \mathbb{K} \\ \qquad \bullet \text{above holds for any term } \blacksquare \text{ (if done one-at-a-time)} )

 

Now we trip. The inner product — which tells you the “angle” between 2 things, in a super abstract sense — is also an instantiation of the Alternating Multilinear Map.

In conclusion, mathematics proves that Size is the same kind of thing as Angle

Say whaaaaaat? I’m going to go get high now and watch Koyaanaasqatsi.

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    I actually understand this. I feel gross.
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