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All questions asked by John Rennie

List all solved & unsolved questions asked by John Rennie

What is time, does it flow, and if so what defines its direction?

9   Physics Asked on 01/10/2021

arrow of time  entropy  special relativity  thermodynamics  time 

Unique solution to an Initial Value Problem

2   Mathematics Asked on 12/27/2021

initial value problems  ordinary differential equations 

Why not generalize the concept of prime numbers?

1   Mathematics Asked on 12/27/2021

prime factorization  prime numbers 

Topologically Transitive Flow on $R^n$

1   Mathematics Asked on 12/27/2021

differential geometry  dynamical systems  fluid dynamics  general topology  nonlinear dynamics 

Solving the system $cos x+cos y+cos z=frac32sqrt3$, $sin x+sin y+sin z=frac32$

2   Mathematics Asked on 12/25/2021

complex numbers  trigonometry 

Distribution of an angle between 3 normally distributed 2D points

1   Mathematics Asked on 12/25/2021

angle  geometry  probability distributions 

Relation between number of edges and the sum of number of vertices of degree k

1   Mathematics Asked on 12/25/2021

graph theory 

About basis of vector space of polynomial degree less than n

2   Mathematics Asked on 12/25/2021

linear algebra  linear transformations 

Dependent Simultaneous Equations

2   Mathematics Asked on 12/25/2021

algebra precalculus  systems of equations 

What is the pdf of $frac{|x-y|}{(x+y)(2-x-y)}$ when $x,y$ are i.i.d uniform on $[0,1]$?

2   Mathematics Asked on 12/25/2021

density function  probability  probability distributions  uniform distribution 

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