approximation - Difference Between PTAS and FPTAS - Computer …
2019年8月6日 · In PTAS algorithms, the exponent of the polynomial can increase dramatically as ε reduces, for example if the runtime is O (n (1/ε)!) which is a problem. There is a stricter scheme, Fully Polynomial Time Approximation Scheme (FPTAS).
PTAS definition vs. FPTAS - Computer Science Stack Exchange
2016年1月5日 · A polynomial time approximation scheme (PTAS) for problem X X is an approximation scheme whose time complexity is polynomial in the input size. and FPTAS definition
PTAS vs. FPTAS input - Computer Science Stack Exchange
2020年1月23日 · I am trying to understand what is the PTAS, FPTAS and what is the difference between them. I found this analysis: PTAS definition vs. FPTAS but I cannot understand what do we mean by saying: "...
Why are PTAS-Reductions used to establish APX-Hardness?
2015年9月5日 · What's the intuition for PTAS reductions instead of approximation preserving reductions or something of that ilk? I'd expect APX-Hardness to mean something like "finding a constant factor approxima...
Meaning behind 1/ϵ in FPTAS - Computer Science Stack Exchange
I am currently learning about FPTAS and PTAS but do not understand what the definition of FPTAS. A fully polynomial time approximation scheme (FPTAS) for problem X X is an approximation scheme whose time complexity is polynomial in …
What is a 5 ptas coin and what is it worth? - Answers
2023年9月23日 · A 5 PTAS coin is short for 5 pesetas, which is what Spain used prior to the Euro. The exact value depends on the date and variety, but for the majority of dates, they're only worth a couple of ...
Are there any problems in $APX - PTAS$ that are not $APX
Yes, at least under some reasonable assumptions. Crescenzi, Kann, Silverstri & Trevisan show that Minimum Bin Packing, Mininum Degree Spanning Tree and Minimum Edge Coloring are APX-intermediate unless the polynomial hierarchy collapses. Considering that the paper is from 1996, I'm sure there's now a significantly larger number of known APX-intermediate problems.
What is the value of a 1957 5 ptas? - Answers
2022年10月22日 · Many of the coins are valued in price close to $10 to $15 each. The value of each coin will vary depending upon their condition.
Max independent set in planar graphs PTAS proof
2020年6月14日 · I've been searching a few hours for a proof to Max independent set in planar graphs beeing in PTAS but I couldn't find anything, I'm searching for one without any reductions and I wonder if anyone here can help me find one. Thanks in advance.
PTAS for Multiple Knapsack with Uniform Capacities, fixed number …
2020年2月21日 · for every j, l, 1 ≤ j <l ≤ m,Uj ∩Ul = ϕ j, l, 1 ≤ j <l ≤ m, U j ∩ U l = ϕ the profit of the feasible solution is ∑m j=1∑i∈Uj pi ∑ j = 1 m ∑ i ∈ U j p i. The goal is to find a feasible solution of maximal profit. I'm trying to show a PTAS for the problem. It …