## pp64 troubleshoot " Input error: empty matrix " Completely lost on how to troubleshoot

This command always gives me input error when trying to pass my .txt file to pp64

## What does "payment in progress " mean?

Does it mean
"Your payment is sent and we will give you the details later"
or
'We are reviewing our earnings, and you could be kicked out if we find something something fishy"
Do people get banned after going into "payment in progress " ?

## How to fix " There was an error creating the child process for this terminal failed to execute the child process "/tmp/<filename> (permission denied)

I was trying to run a c++ program from atom text editor.I have set gnome terminal for the gpp compiler . While I try to compile the program it shows the error " There was an error creating the child process for this terminal failed to execute the child process "/tmp/filename> (permission denied)". While the same program runs in codeblocks using the same genome terminal. And further I have previously run c++ programs from atom using genome terminal and it worked fine at that time. How can I fix this issue?

## Are there Any Apps/ Browser Add-Ons to make " Web App " Notifications or Easy Methods?

Are there Any Apps/ Browser Add-Ons to make " Web App " Notifications or Easy Methods? Say I want to use Google Voice in it’s own browser for isolation. Is there any way to get notifications when I receive a new message or call in their web app?

Thanks!

## algebraic geometry – Construction of Quot schemes and construction of certain closed subschemes

I am again studying Nitsure’s Construction of Hilbert and Quot schemes, and I am yet again stuck, this time on page 25. I understand what lemma 5.4 says, but I do not get its proof. Let me sketch the outline:

$$Xlongrightarrow S$$ is a projective morphism where $$S$$ is Noetherian, and $$psi:Elongrightarrow F$$ a surjective morphism between coherent $$X$$-sheaves. They construct a closed subscheme $$T’subseteq T$$ as follows:

(…) This is satisfied by taking $$T’$$ to be the vanishing scheme for the composite homomorphism $$ker(phi)hookrightarrow Elongrightarrow F$$ of coherent sheaves over $$X_{T}$$.

To me, the $$T’$$ thus constructed is a subset of $$X_{T}$$, not of $$T$$.

EDIT: Also, why exactly does this lemma prove that the representability of $$mathfrak{Quot}^{phi,L}_{G/X/S}$$ implies the representability of $$mathfrak{Quot}^{phi,L}_{E/X/S}$$?

## Tag times in " " is protected

I want to take a derivative of the following expression and apply a substitution as well. The expression is,

``````Q_{xx}(t) = (mu * a^2 * (1-e^2)^2 * Cos(psi(t))^2 )/(1 + e * Cos(psi(t))).
``````

The derivate of the above function has to be taken with respect to t and the following substitution has to be made,

``````psi(t)' = (1 + e * Cos(psi(t)))^2.
``````

How to do this calculation if I have to take multiple derivatives? I keep getting some or the other error.

## ag.algebraic geometry – Construction of derived Quot scheme

I study the construction of derived Quot schemes in paper “ Shifted symplectic structures on derived Quot-stacks ”(arXiv:1908.03021).

Derived quot stacks are constructed from sheaves of non-positively graded dg algebras in section 3 of the paper.

In particular, I have some question about differentials of the dg algebras.

Question

1) The last line of page 14, a differential is constructed by the morphism

$$mathcal{V}_j otimes left (bigotimes_{1 leq l leq m+1} mathcal{A}_{i_l} right) otimes (W_i)^vee rightarrow mathcal{V}_j otimes left (bigotimes_{1 leq l leq m} mathcal{A}_{i_l} right) otimes (W_{i+i_{m+1}})^vee$$ .

However it seems to me this morphism does not degree 0 morphism and this should be the morphism

$$mathcal{V}_j otimes left (bigotimes_{1 leq l leq m+1} mathcal{A}_{i_l} right) otimes (W_{i+i_{m+1}})^vee rightarrow mathcal{V}_j otimes left (bigotimes_{1 leq l leq m} mathcal{A}_{i_l} right) otimes (W_{i})^vee$$.

Is this correct ?

2) Does the differential $$delta_W$$ constructed from the above morphism really become a differential ?
It seems to me that $${delta_W}^2 neq 0$$

3) Do we need the differential on $$C^{bullet}$$ constructed from the multiplication on $$oplus mathcal{A_i}$$ like that on $$B^{bullet}$$ on line 10 of page 13.

Thank you !

## can anybody explain the difference between " WHERE CAST(SUBSTR(M.year,-4) AS UNSIGNED) < 1970" and "year<1970"

when iam working with "year<1970" in sql I got different answer and using this "WHERE CAST(SUBSTR(M.year,-4) AS UNSIGNED) < 1970" i got the actual answer what i want.can anybody explain the syntax clearly.

## How to uncheck "When switching to an application, …" Mission Control option from command line

How can I uncheck the option in System Preferences -> Mission Control -> When switching to an application, switch to a Space with open windows for the application via command line, with the `defaults` command?

## How to reproduce "resource busy and acquire with NOWAIT specified or timeout expired " error on local machine in oracle

I am running oracle database and I am getting error as "resource busy and acquire with NOWAIT specified or timeout expired " and because of this error i am getting some other exceptions. on my local machine I am not getting this "resource busy …" error. basically I want to reproduce this error on my local machine . is there any way to reproduce this error manually on my local machine?