12:16 AM
D1, D2, D3, D4
D5, D6, D7

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1 hour later…
10:54 AM
CD - also note the score of the linked question !

1 hour later…
11:56 AM

12:27 PM
0

So I've been trying to construct the inverse operation of the conjectured solution. Let's say I have the following differential operation: $$\frac{d_1 f}{d_1 x} = \frac{f(x+ \epsilon) - f(x)}{\epsilon}$$ $$\frac{d_2 f}{d_2 x} = \frac{f(x+ 2\epsilon) - f(x)}{\epsilon}$$  \frac{d_3 f}{d_3 x...

1 hour later…
1:44 PM

2:55 PM

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3:50 PM
@JoséCarlosSantos I'm not sure why you reopened this. It's true that the text of the question contains a condition (iv) which is in truth not covered in the duplicate, but the user indicates they are not asking about (iv). Anyhow I went ahead and posted an answer with links to the duplicates covering the question the user is asking.
Really it would probably have been sufficient to duplicate it as this since that is apparently what the user has trouble seeing.
Ok maybe it is more accurate to say "the user gives no indication of asking about (iv)" rather than "indicates they are not asking." And let me clarify I won't have much heartburn if the question stays open.

4:15 PM
@rschwieb I missed the fact that the OP was not asking about condition (iv) and I have closed it again.

4:27 PM
The last comment here is annoying , but flagging it will probably be pointless. We still need votes to at least close the question.

3 hours later…
7:47 PM

8:14 PM
@ArcticChar D11 is up for deletion now but inexplicably got one reopen vote...

8:48 PM
@user21820 Yeah, some user(s) casted reopen votes on D1, D2 and D11 yesterday, soon after I posted the requests. I think I can understand the vote on D2, but the other two are just weird.