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    Home Unlabelled In what kinds of logic (or formal systems) does this book describe the semantics of programming languages? Computer Science

    In what kinds of logic (or formal systems) does this book describe the semantics of programming languages? Computer Science

    July 12, 2020

    In what kinds of logic (or formal systems) does this book describe the semantics of programming languages? Computer Science

    In what kinds of logic (or formal systems) does this book describe the semantics of programming languages?

    Posted: 11 Jul 2020 06:13 PM PDT

    In "Practical Foundation of Programming Languages", I was wondering in what kinds of logic (or formal systems) the semantics (e.g. typing and evaluation) of programming languages are described? (for example, ch2, 3, 4 and 5 in the book)

    To get the basics of the kinds of logic (or formal systems), could you recommend some books for me to read?

    Thanks.

    submitted by /u/timlee126
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    Is every sentential form also a right-sentential form?

    Posted: 11 Jul 2020 05:07 AM PDT

    Ullman's Introduction to Automata, Languages and Computing (1979) says

    10.6 LR(0) GRAMMARS

    ...

    A right-sentential form is a sentential form that can be derived by a rightmost derivation.

    Is every sentential form also a right-sentential form, by definition? (I guess so.) In Chapter 4 Context Free Grammars, I learned that

    • Given a CFG, a sentential form is a string of terminals and nonterminals which can be derivable from the start symbol.

      Since a sentential form is derivable from the start symbol, there exists at least one parse tree from the start symbol and the sentential form.

    • If w is in L(G) for CFG G, then w has at least one parse tree, and corresponding to a particular parse tree, w has a unique leftmost and a unique rightmost derivation.

      I think the same can be generalized from a string of terminals to a sentential form.

    So isn't it that each sentential form always has at least one rightmost derivation? Therefore, isn't every sentential form also a right-sentential form, by definition? Why is the concept of "right sentential form" introduced?

    Thanks.

    submitted by /u/timlee126
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    Why Javascript is considered as a "bad" language?

    Posted: 12 Jul 2020 01:55 AM PDT

    I enjoy with it, it has LOT OF material to learn and easily accessible by anyone else. Why the hate?

    submitted by /u/Enguzelharf
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    Does it matter if my compression program has a really bad big O notation time?

    Posted: 12 Jul 2020 02:28 AM PDT

    Does it matter if my compression program has a really bad big O notation time if I can compress any binary string over 64bits into 64bits?

    submitted by /u/iamnemo___
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    Which is best suited AWS certification for Manual QA

    Posted: 11 Jul 2020 10:50 PM PDT

    And what is the best resource to learn it.

    submitted by /u/arpitsharma14
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    Does anybody else find writing binary to hex conversions cathartic?

    Posted: 11 Jul 2020 06:53 PM PDT

    I just think its cool. That's all :)

    submitted by /u/SmartSpinach7
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    Recursive Backtracking For Combinatorial, Path Finding, and Sudoku Solver Algorithms

    Posted: 11 Jul 2020 07:41 AM PDT

    “Using probability wave to figure out by what primes a number can be divided” A question about this quote

    Posted: 11 Jul 2020 10:37 AM PDT

    The quote is from a Reddit comment I found that is about explaining quantum computer in a simplified fashion. This post also lead me read a bit about electrons acting as wave.

    My question in this case is how does probability waves interact with an integer? My brain is just lacking the perception to understand it. Can someone explain to me how a quantum computer can use electrons' wave nature to quickly amplify correct answers regarding finding prime numbers of enormous integers? I think electrons are what makes a computer function(?) and hence allows a program to run. But how does electrons acting like wave in a computer occur? I might be even asking dump questions honestly. Hopefully this is the place to find an explanation

    submitted by /u/Former_Sea
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    Digital logic design rigorous approach

    Posted: 11 Jul 2020 08:39 AM PDT

    Things youcan do on cloud

    Posted: 11 Jul 2020 05:45 AM PDT

    Check This Out

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