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/sci/ - Science & Math

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8036955 No.8036955 [Reply] [Original]

I quit Math when they started using musical notes.

https://en.wikipedia.org/wiki/Musical_isomorphism

>> No.8036958

>>8036955
Oh yeah, well I quite math when they started using infinite sets.

>> No.8036967

>>8036955
Those are flat and sharp signs, you cunt. They raise and lower pitches, antirespectively. It's a joke.

>> No.8036969

Actually the musical isomorphism makes a lot of sense.
Vectors have upper indices. 1-forms have lower indices.
The flat morphism lowers the upper indices to lower indices and makes a 1-form from a vector field... (by taking inner products with respect to the metric)

>> No.8036972

>>8036967
>antirespectively
Why would you choose to write this way?

>> No.8036991

>>8036972
I didn't feel lime going back and change things around. First though, best thought.

>> No.8037001

>>8036991
At least your attitude is consistent.

>> No.8037004

>>8037001
Damn skippy

>> No.8037015

>>8036955
>wonder what this is about
>lowering and raising indices
Huh, never heard that notation. The more you know.

>> No.8037973
File: 28 KB, 800x425, mathematicians smh.png [View same] [iqdb] [saucenao] [google]
8037973

>not giving up when your indigenous bundles start sleeping

>> No.8037987

>>8037015
Well its a bit more than that. They are maps between the tangent and cotangent bundles. Vector fields are sections of the tangent bundle and 1-forms are sections of the cotangent bundle.

So what you get out of this is a way to map a vector field to a 1-form or vice versa.