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#### Kevin Bryan

##### Guest
When I try to run the command npx prisma migrate dev --name init I get this error message:

Code:
Error: P1010: User johndoe was denied access on the database mydb.public

I don't remember setting up a user "jhondoe", I just installed postgres desktop on my mac and that's it. I'm new to databases and backend dev so I'm not sure if I did setup a user.

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#### How to prove that a po [duplicate]

Swarupananda Dhua Asks: How to prove that a po [duplicate]
How can I prove that if a polynomial of

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#### How to solve Poisson's equation for the potential?

• AnonAstroZ
• Physics
• Replies: 0
AnonAstroZ Asks: How to solve Poisson's equation for the potential?
i'm working with a spherical symmetric system and have found it to have mass density $\rho$ = $\frac{1}{4\pi r^2} \frac{dM(r)}{dr}$.

Poisson's equation says $\nabla^2 \Omega(r)$ = $4\pi G \rho(r)$.

I'm confused on how to solve this equation for the potential $\Omega$ given the $\rho$ that i found. Is there anyone that can advise or provide a starting point? I have been out of school and mathematics for a few years. Thank you!

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#### why do magnetic fields exist as line?

• SONIC BooM
• Physics
• Replies: 0
SONIC BooM Asks: why do magnetic fields exist as line?
why there are no magnetic field lines between two magnetic field lines. why don't magnetic fields exist as a solid Ovid of influence?

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#### What is an intuitive way of understanding the direction of static friction during rolling normally or up or down?

• Tian Pu
• Physics
• Replies: 0
Tian Pu Asks: What is an intuitive way of understanding the direction of static friction during rolling normally or up or down?
some of the answers to the question involved a more detailed analysis, but is there a way to understand the direction without doing so?

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#### How is work done by Tension zero in this case?

• Nishchal123
• Physics
• Replies: 0
Nishchal123 Asks: How is work done by Tension zero in this case?
How is the Work done by tension in this case .Theres no horizontal force acting so Com wont displace in horizontal it will be in vertical. But Workdone by tension in m should be T2l/3 costheta and 2m should have been T✓l^2 + 2l^2/3 costheta .How is it zero?

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#### How can I use the Table and Append commands to make Dimen

• Julissa Velasquez
• Mathematics
• Replies: 0
Julissa Velasquez Asks: How can I use the Table and Append commands to make Dimen
I have two sets of data with different dimensions. I would like to use the Table function to create data to fill the dimensions and append it to the set, so both sets have the same dimensions.

I would like to start from the last value and create various x values (up to 2500) while the y can stay the same. So that data2 {917, 2} matches the dimensions of data 1 {1337,2}. Any insight would be greatly appreciated.

Code:
 In[1]:= data1 =
Import["/Users/julissavelasquez/Box/1_Harrison Lab/03_Formic \
Acid/Wodtke_2021_Fig4C/hyperthermal_dist.xlsx", "SkipLines" -> 2][[1]];

In[2]:= data2 =
Import["/Users/julissavelasquez/Box/1_Harrison Lab/03_Formic \
Acid/Wodtke_2021_Fig4C/thermal_dist.xlsx", "SkipLines" -> 2][[1]];

In[3]:= {Dimensions[data1], Dimensions[data2]}

Out[3]= {{1337, 2}, {917, 2}}

In[4]:= data2[[1 ;; 2]]

Out[4]= {{2.9895, 0.00054879}, {5.979, 0.00054814}}

In[5]:= data2[[-2 ;; -1]]

Out[5]= {{2487.29, 2.7924*10^-6}, {2490.28, 2.1354*10^-6}}

In[6]:= Table[data2, {i, 2490.28, 2500}]

Out[6]= If[25048064219406400976 === \$SessionID,
Out[6], Message[
MessageName[Syntax, "noinfoker"]]; Missing["NotAvailable"]; Null]

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#### How can I Prove this? Is the explanation correct?

alwayscurious Asks: How can I Prove this? Is the explanation correct?
The Problem is:- if there is a polynomial-time, additive 80-approximation algorithm for the Minimum Vertex Cover problem, then P = NP.

What i am thinking is, since we already know that the Min vertex cover + 80 vertices which spans vertex cover can be solved in polynomial time and then we need to find V-80 vertices from V ( V is total number of vertices in vertex cover) which is also vertex cover. this can also be done in polynomial time. Therefore the Min. Vertex Cover Problem can be solved in polynomial time. Therefore, P=NP.

I feel like this is wrong explanation. Any help is appreciated.

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