## function construction: why does this boolean calculation get stuck?

I want to build a boolean function that takes three parametric functions. I don't really know how to write a function for this, but this seems to work for me as long as the parameter is `t`.

``````isCorrect(f1_, f2_, f3_) := Assuming(t >= 0, Refine(If(
1 + f1 + f2 + f3 >= 0 &&
1 + f1 - f2 - f3 >= 0 &&
1 - f1 + f2 - f3 >= 0 &&
1 - f1 - f2 + f3 >= 0, True, False)))
``````

For some functions it gives the correct value.

``````In():= isCorrect(Cos(t), Cos(t), 1)
Out()= True
``````

But for some examples like the following, it does not generate anything.

``````In():= isCorrect(Exp(-t) Cos(t), Exp(-t), Exp(-t))
Out()= If(1 - 2 E^-t + E^-t Cos(t) >= 0, True, False)
``````

But I know that `Plot(1 - 2 E^-t + E^-t Cos(t), {t,0,10})` returns the following and is always nonnegative for t positive.

So i don't know why `isCorrect` does not come out `True` so.

Any suggestion would be appreciated.

EDIT:

``````In():= Assuming(t >= 0, Reduce(1 - 2 E^-t + E^-t Cos(t) >= 0))`
Out():= Cos(t) (Element) Reals && ((E^-t < 0 && Cos(t) <= E^t (-1 + 2 E^-t)) || E^-t == 0 || (E^-t > 0 && Cos(t) >= E^t (-1 + 2 E^-t)))
``````

Why can't you solve it? `E^-t` It can never be negative. Too, `Cos(t)` it's always real since `t` it is explicitly assumed to be positive.

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My iPhone screen is completely frozen. I pressed the power button just to turn off my phone, but when it came back on it was still frozen, so I have no way of accessing my phone. emphasized text

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Are there any known cases of penalization for staying longer when the "offender" had no way of avoiding it? Or any country that has explicitly declared that it will impose such sanctions despite the "offender's" lack of options?

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After a tutorial to shrink Windows partition from Windows, I ran into some issues on the `shrink querymax` happened, and they informed me that I needed to use `chkdsk` because the partition was apparently damaged.

Since then I have tried to boot Windows three times separately, but the `chkdsk` The "repairs" never exceed 30% (I left it on for two hours straight once to be sure).

I can still start in Ubuntu and I can access all my Windows files from there, but I can't start in Windows.

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Please note that we are trying to connect to local SharePoint (version 2016) with the iOS mobile app for SharePoint. For the connection, we use corporate Wifi or 4G through VPN.

Once we open the app, we enter the On-Prem URL and then pass the login screen successfully. However, after that, the app goes into a loop with a "Your Account Settings" screen.

By trying the same scenario with the Android version of the app, we can login and explore the SP 2016 instance.

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