/sci/ - Science & Math

>>11709074
he even made a typo in his first sentence>>11708938. all the while calling people who make typos are stupid in the very post. this cannot be topped

>>11538919
>/sci/ posters who deny free will

why is combinatorics so hard

Looking for an explicit expression for this series
1/2, -1/2, -1, -1/2, 1/2, 1, 1/2, -1/2...

What is the difference between electricity and magnetism. Why do they not have identical properties?

>>9096285

>He took precalculus

>>9089069 I'm a brainlet but here are the brainlet intuitions/mental images I used to make sense of vector calc. I know none of this is rigorous or anything, they're just intuitons, so rigorfags fuck off >Why is line integrals use arc length, but surface just use regular area? An arc length element "ds" can be thought of as a tiny bit of (locally) straight line hugging a curve. Taking the aggregate of all these approximations and then taking the limit of infinitely small polygonal lines gives you exact length, even if no finite sum of little "Δs"s does. In the same way, summing small rectangular patches over a surface that are locally flat approximates the surface area, and rhe magic of limits cleans up the approximation. Since all these little rectangles on the surface can be projected onto the underlying x-y plane via a dot product with the normal, integrating over the surface amounts to integrating over the corresponding x-y plane underneath (dS= (normal vector)dA) >Idea of Curl vs Divergence. The curl of a vector field, roughly speaking, gives you the amount of torque/twisting a small rod immersed in it would feel, while divergence tells you how much of the field is going into vs leaving a point in each direction (x,y,z)Which way is the curve actually going?

>tfw your university is ranked in top 10 universities in the world

Pic related

I was doing random analysis stuff when I came up to
a ∈ (extended) R, a != 0 --> a^inf=0

Does anyone know what is this identity (if it's true) is called?

does anyone know any hacks to getting a good sats score? My dad went to university of pensylvenia and my bro went to oxford, but I can't get above a 1350

also post ur sats scores

What would a world where there is three spatial dimensions and two time dimensions look like?