Miscellaneous Solutions and Posts

Old Stuff (I was still an uNd3RgR@D🤓):

(1/a)arctan(x/a) Derivate Walkthrough and Proof

y''+16y=0

e^(y)y'=e^(2y)+4e^(y)+13

Linear Algebra Done Right proof:

Axler Linear Algebra Done Right Section 7.D Exercise 10

Number Theory Stuff:

Prove that no integer in the following sequence is a perfect square.

Combinatorics Stuff:

Proof of Vandermonde-like Identity

⌊x+y⌋=⌊x⌋+y