Does Type:Type lead to inconsistency without general inductive types?

In e.g. Agda , it is possible to derive an element of the empty type by enabling the “type in type” option.

Every proof I have seen (and come up with) involves making a special inductive type definition. Can a contradiction be derived using type in type but with e.g. only using standard library types?

Can a TLB hit lead to a page fault?

$ Can$ $ a$ $ TLB$ $ hit$ $ lead$ $ to$ $ a$ $ page$ $ fault?$

My answer is yes, as say even after a TLB hit if the page in the memory is dirty and it will lead to Page fault. Other case can be that, it is read only and we want to write that page which will eventually lead to page fault.

Now wrt this context, let me ask u question that was asked in GATE 2020 exam(India’s one of the most prestigious examination to get into $ IIT’s$ for Masters and PhD). I know this is not a question ans posting site, but for the sake of clearing my doubt I have to, and the concept can be understood well through this question. The questions goes like this–>

Consider a paging system that uses $ 1−level$ page table residing in main memory and a TLB for address translation. Each main memory access takes $ 100 ns$ and TLB lookup takes $ 20 ns$ . Each page transfer to/from the disk takes $ 5000 ns$ . Assume that the TLB hit ratio is $ 95%$ , page fault rate is $ 10%$ . Assume that for $ 20%$ of the total page faults, a dirty page has to be written back to disk before the required page is read from disk. TLB update time is negligible. The average memory access time in ns (round off to $ 1$ decimal places) is _______.

There is a lot of fuss going around this question as the answer provided by the exam authority is claiming it to range from $ 154.5ns$ $ to$ $ 155.5ns$ , but many fellow scholars are claiming that it should be $ 725ns$ as there can still be page faults if there are hit in the TLB. Moreover this question is of $ 2$ marks. So its correctness can change the life of many students.

Your suggestion matters. Whole India is looking for your help.

Thank you.

how to make sure vulnerability management does not lead to reduced to compromised security

when running vulnerability scans often a particular version of say Node.js is reported to be vulnerable along with a recommendation to update to a higher version. Then we have also unsecure TLS, SSL protocols like TLS 1.0 and SSL 3.0 and it’s recommended to disable them altogether. For me, any of the above recommendations is a change that needs to be applied to a given application, host etc. Now I’m wondering have one can make sure that any of two changes does not lead to reduced or compromised security? How one can make sure that the new Node.js version is not introducing even more severe weaknesses / vulnerabilities ? How does change management fit into this ? In the end updating the Node.js version or disabling unsecure TLS/SSL protocols is a change request? Isn’t it?

Why do I always have something missing in my understanding of topics which always lead me to solve problems incorrectly?

I am computer science masters student, i come from background of engineering and not cs, my problem is whenever i have a problem set, a programming task or an exam. i always try hard to understand the question and think for the right answers, but i usually either get stuck or have a wrong answer, and when i seek help i figure out i wasn’t completely understanding the topic of the question itself, missig some part of the information in or even having a wrong understanding to some parts.
So my question is, how i can approach a computer science topic “for e.g. operating systems” and have a good understanding with the right depth to have a better comprehension and to be able perform better at programming tasks and exams.

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Best way to indicate secondary list items within an expandable list will lead to a new screen? iOS mobile app

I’m designing a page with an accordion list (not a sidebar menu) in a financial iOS app. I’m trying show that eacg primary list item is expandable/collapsible (indicated by up-down chevrons), and that secondary items within each primary list item will lead to a new page (indicated by right chevrons).

This is what the list looks like collapsed: List Collapsed

And expanded:

List Expanded

Is having a mix of so many chevrons confusing and cluttered? What’s the clearest way to display this?