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All questions asked by Dean Black

List all solved & unsolved questions asked by Dean Black

Stolen code in a GPL repo

1   Law Asked on 11/13/2021

copyright  gpl  liability  software 

Is there any visual representation on why (certain) trigonometric functions have infinite derivatives.

2   Mathematics Asked on 11/14/2021

calculus  derivatives  trigonometry 

Is $(I circ A - I circ B)$ positive semi-definite if $A$, $B$ and $A - B$ are positive semi-definite?

1   Mathematics Asked on 11/14/2021

hadamard product  linear algebra  matrices 

$f^{*}$ is surjective if and only if $f$ is injective

2   Mathematics Asked on 11/14/2021

elementary set theory  functions  proof explanation 

Rational singularity of Spec, Proj and Spec of localization of a standard graded $2$-dimensional ring

0   Mathematics Asked on 11/14/2021

algebraic geometry  birational geometry  commutative algebra  derived functors  schemes 

Determine the lie algebra of the subgroup of SO(4)

3   Mathematics Asked on 11/14/2021

differential geometry  lie algebras  lie groups 

How to use general recursion to generate a set of words?

2   Mathematics Asked on 11/14/2021

elementary set theory  recursion 

Calculate Hessian of a "weird" function

2   Mathematics Asked on 11/12/2021

derivatives  multivariable calculus 

Find volume under given contraints on the Cartesian plane.

2   Mathematics Asked on 11/12/2021

integration  multiple integral  multivariable calculus  volume 

Equivalence of Classical Nullstellensatz to "Affine schemes have points"

1   Mathematics Asked on 11/12/2021

algebraic geometry  commutative algebra  ring theory 

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