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vzn
1:58 AM
@overexchange think he has some point. here is the associated written essay medium.com/@brianwill/…
 
 
6 hours later…
7:39 AM
0
Q: Question turned into tl;dr, answer is not completely correct, what next?

HaraldThe question is already quite long, with two different formulations. And I noticed that my own answer to my question is not 100% correct. Consequently I would like the question to get some new attention. Now I could Completely trim and reformulate the question and remove or mark my answer as ...

 
 
2 hours later…
9:12 AM
Question: Show that there is an oracle A and a language L ∈ NPA such that L is not polynomial-time reducible to 3SAT even when the machine computing the reduction is allowed access to A.
I am stuck at this question. It is an exercise from Sanjeev Arora and Boaz Barak.
It is not homework. Any hints ?
 
10:08 AM
0
Q: How to show that Cook-Levin theorem does not relativize?

sashaThe following is an exercise which I am stuck at ( source: Sanjeev Arora and Boaz Barak; its not homework ) : Show that there is an oracle $A$ and a language $L \in NP^A$ such that $L$ is not polynomial-time reducible to 3SAT even when the machine computing the reduction is allowed access to ...

 
 
8 hours later…
vzn
6:04 PM
@sasha hint, consider what complexity class A is in. see also
7
Q: Baker Gill Solovay $P^B \ne NP^B$ relativization, what class is $B$ in?

vznA recent question asks whether relativization is well-defined. This question wonders how to put one use of it on firmer ground. In the BGS 1975 proof that there exists a language $B$ such that $P^B \neq NP^B$. To best available knowledge, what complexity class is $B$ in? Fill in the bla...

there are a bunch of refs to/ outlines of BGS 75 around the internet, google easily finds them.
you said earlier youre not in a CS masters program, so which field then?
 
 
3 hours later…
9:13 PM
1
Q: How many $(x, y)$-paths of length $20$ are there, where $x$, $y$ adjacent vertices in cycle $C_5$?

StudentAs the title of the question suggests, let $x$ and $y$ be two adjacent vertices in the cycle $C_5$. How many $(x, y)$-paths of length $20$ are there?

 
 
1 hour later…
10:22 PM
2
Q: How to prove that SQUARE-PRODUCT is NP-hard or easy?

1-approximationI am interested in the complexity of the following problem: SQUARE-PRODUCT INSTANCE: Two sets $A=\{a_1,\ldots,a_n\}$ and $B=\{b_1,\ldots,b_n\}$ of non-negative integers, a positive integer $k \le n$ and a positive integer $\Delta$. QUESTION: is there a subset $S$ of $\{1,\ldots,n\}$ of size $...

 
11:20 PM
hey guys, so I'm reading through this book : Compiler Construction, Principle and Practice by Kenneth C. Louden
In Chapter 6 (semantic analysis) example 6.2, the following grammar is given:
 

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