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72 views

Are all databases reducible to this ultimate abstract database design?

I've designed a few databases in my time, and on more than one occasion the drive to abstract common elements from specific tables has led me to create generic top-level tables which contain those ...
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1answer
23 views

Chomsky form for language of single alphabet member

I'm a bit confused as to how to represent the Chomsky form for the language L that generates all strings with the alphabet {a} My approach was ...
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2answers
70 views

The importance of normal forms like Chomsky normal form for CFGs

I understand that context-free grammars can be used to represent context-free languages.It might have ambiguities. We also have normal forms like Chomsky and Greibach normal form. I couldn't ...
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62 views

CFG to Chomsky normal form

I've read this part like 3-4 times and I'm not understanding what is going on. Let G6 be the following CFG and convert it to Chomsky normal form by using the conversion procedure just given. The ...
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55 views

Converting first-order formula to CNF

I need to convert this statement to CNF (Conjunctive normal form): $\qquad \left((\forall x.\, P(x)) \implies Q(a)\right)\implies \left((\exists y.\, P(y)) \implies Q(a)\right)$ I got this answer: ...
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159 views

“Applicative order” and “Normal order” in lambda-calculus

Applicative order: Always fully evaluate the arguments of a function before evaluating the function itself , like - $(\lambda x. x^2(\lambda x.(x+1) \ \ 2))) \rightarrow (\lambda x. ...
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125 views

3CF 3-conjunctive form satisfiability

I am self studying discrete math and I am going through MIT Mathematics for CS lecture notes but they do not have solutions available. I got stuck at Problem 3.14 (pages 64-65 of this document). The ...