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All questions asked by jack jack

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Mongo exception: connect failed on reboot

2   Database Administrators Asked on 02/12/2021

mongodb  ubuntu 

How to check if $phi(n)$ is a perfect square?

0   Mathematics Asked on 12/23/2021

elementary number theory  number theory  sequences and series  totient function 

Find the generating function of $S_n$(Please check my idea)

0   Mathematics Asked on 12/23/2021

discrete mathematics  generating functions 

Could the "post-forcing continuum" be a new cardinality?

0   Mathematics Asked on 12/23/2021

axiom of choice  forcing  logic  set theory 

Are these true for a martingale? $Eleft[ frac{X_{n+1}}{X_n} right] = 1, Eleft[ frac{X_{n+2}}{X_n} right] = 1 $

1   Mathematics Asked on 12/23/2021

expected value  martingales 

Linear programming: model to only pick 10% of the variables as non zero

1   Mathematics Asked on 12/23/2021

binary programming  linear programming 

Solving vector differential equation

0   Mathematics Asked on 12/23/2021

derivatives  partial differential equations  vector analysis 

The Optimal Toaster Problem

1   Mathematics Asked on 12/23/2021

combinatorics  number theory  puzzle 

What does the "$bigwedge$" symbol mean in "$bigwedge_{j=1,ldots,M,jneq i}Delta_i(x)>Delta_j(x)"$?

2   Mathematics Asked on 12/21/2021

notation  probability 

Find $f(t)$ such that $ int_0^{2 pi} f(t + theta) ln(2 sin frac{t}{2}) dt = frac{e^{i theta}}{e^{-i theta} - a e^{i phi}} $

1   Mathematics Asked on 12/21/2021

complex analysis  complex integration  definite integrals  integration 

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