Search found 110 matches

by kenbrooker
Sat Jul 13, 2019 9:56 am
Forum: Discrete Mathematics
Topic: The Satisfiability Problem... NP or P?!
Replies: 4
Views: 1554

Re: The Satisfiability Problem... NP or P?!

https://medium.com/swlh/the-boolean-satisfiability-problem-solved-48ceb5550115 Now reads -- The Boolean Satisfiability Problem vilely censured. "Apologies: someone hacked the article to avoid sharing this technology." I guess that "someone" is me because I privately asked the author a couple of que...
by kenbrooker
Sun Jun 30, 2019 12:00 am
Forum: Discrete Mathematics
Topic: The Satisfiability Problem... NP or P?!
Replies: 4
Views: 1554

Re: The Satisfiability Problem... NP or P?!

A typo in Dato's Theorem One; supposed to read --

(not x | x and y | z1) · (x and y | not y | z2) · (z1 | z2 | x <-> y) = 1

and... Only a Tautology with respect to x and y, a sample of
Dato's different approach to Logic...
by kenbrooker
Thu Jun 27, 2019 6:44 pm
Forum: Discrete Mathematics
Topic: The Satisfiability Problem... NP or P?!
Replies: 4
Views: 1554

Re: The Satisfiability Problem... NP or P?!

Thanks! jaap ... What would I do without jaap 's astute "Reply"s? And Thanks for posting the link; the least I could/should have done... I think English is a second language for Dato and, mistranslations aside, I am still interested in trying to code his algorithm: a) to see if I even understand it...
by kenbrooker
Thu Jun 27, 2019 7:45 am
Forum: Discrete Mathematics
Topic: The Satisfiability Problem... NP or P?!
Replies: 4
Views: 1554

The Satisfiability Problem... NP or P?!

Found a June article via "Medium" titled The Boolean Satisfiability Problem, solved? by
Juan Manuel Dato (Ruiz?) and trying to work through it to...
Confirm what would be... Ramanujanesque...

Anyone know of any pros or cons??
Anyone know how to...
Contact Dato?!
by kenbrooker
Wed Jun 19, 2019 8:12 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 101
Replies: 7
Views: 4704

Re: Problem 101

Help received from dawghaus4 and
Mission Accomplished and
reported on PE.net;
Thankyou...
by kenbrooker
Fri Jun 14, 2019 4:45 pm
Forum: News, Suggestions, and FAQ
Topic: Errors/Warnings/Bugs
Replies: 497
Views: 96030

Re: Errors/Warnings/Bugs

For what it's worth --
Picture not missing for me, on
Google Chrome...
by kenbrooker
Wed Jun 12, 2019 9:22 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 101
Replies: 7
Views: 4704

Re: Problem 101

kenbrooker wrote:
Thu Mar 29, 2018 10:15 pm
Asked for "HELP!" @ PE.net top of Page 9 for Problem 101, as glasshopper,
If anyone would care to reply there or, via PM, here @ PE.chat?
Thanks in advance...
by kenbrooker
Wed Jun 12, 2019 7:45 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 622
Replies: 6
Views: 3994

Re: Problem 622

Jochen_P wrote:
Mon Jan 07, 2019 7:47 am
In the mean time I know exactly what the maximum deck size for s(n) = 60 is, or any other amount of shuffles
for that matter, ... but the decks in between are still a mistery [sic] to me.
"In between" well said; the minimum deck size is also conspicuous...
by kenbrooker
Mon May 27, 2019 10:53 pm
Forum: News, Suggestions, and FAQ
Topic: Quantum Computing
Replies: 0
Views: 4748

Quantum Computing

"Free for a limited time only," there is an IMHO excellent, highly interactive introduction to Quantum Computing from Brilliant Math & Science at: https://brilliant.org/ Click on "COURSES" first... EDIT: Just discovered that only the first 13 of 33 lessons are free, however, I think that leaves one...
by kenbrooker
Mon Apr 22, 2019 2:27 am
Forum: Clarifications on Project Euler Problems
Topic: Clarification on Project Euler Problems...
Replies: 2
Views: 1033

Clarification on Project Euler Problems...

ok... I give up... Why are so many Project Euler problem solutions
qualified as mod (10^9 + 7 [or + 9])??
by kenbrooker
Wed Mar 06, 2019 8:35 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 96
Views: 18498

Re: Problem 008

I am just as "guilty" by finding jaap's post last instead of in the first place...
by kenbrooker
Wed Feb 27, 2019 6:39 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 96
Views: 18498

Re: Problem 008

Thanks sjhillier and I agree with your feeling that the wording is not necessarily misleading if one keeps in mind that the problem refers to a "number" , not to a two-dimensional array... Or, as jaap posted, 4 years ago, to the nearest day -- Re: Problem 008 Post by jaap » Thu Feb 26, 2015 4:08 am...
by kenbrooker
Tue Feb 26, 2019 11:48 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 008
Replies: 96
Views: 18498

Re: Problem 008

Absotively , although, without checking, 9989 may also appear elsewhere (or even 9999) "adjacently," only because the 1000-digit number is not presented as a number , "consecutively" and "contiguously(?)"... IOWords, IMHOpinion, your rewording is... Superior Freiling :) I guess an Administrator may...
by kenbrooker
Wed Jan 30, 2019 8:59 pm
Forum: Programming languages
Topic: Learning HTML & CSS...
Replies: 0
Views: 4755

Learning HTML & CSS...

If interested, Geeks4Geeks today announced a free, online tutorial, in a one-week format,
by which to learn HTML and CSS at:

https://www.geeksforgeeks.org/introduct ... st-1-week/
by kenbrooker
Mon Jan 28, 2019 7:22 am
Forum: Recreational
Topic: Suggest me a book
Replies: 13
Views: 8998

Re: Suggest me a book

So happy to see my name disappear as "LAST POST"er on several topics...
Otherwise I look like a... Conversation Killer... :(
by kenbrooker
Thu Jan 24, 2019 4:28 am
Forum: News, Suggestions, and FAQ
Topic: Weird runtime behavior
Replies: 8
Views: 1807

Re: Weird runtime behavior

Final (Anti-Climactic) Report: The "Original" and "Improved" codes find the 10 millionth prime number (179,424,673) in 3,929 and 3,928 seconds, respectively; so, at least the "All New and Improved" code is not slower(!!) but, it's not exactly "Improved" either; and, still being surprised only shows...
by kenbrooker
Wed Jan 23, 2019 8:27 pm
Forum: Recreational
Topic: Suggest me a book
Replies: 13
Views: 8998

Re: Suggest me a book

Thanks elissasmart , and Great books on the... Limits of Math: Godel's Proof by Ernest Nagel and James Newman with a new Foreword by Douglas Hofstadter 2001 :D :D :D :D :D A World Without Time - The Forgotten Legacy of Godel and Einstein by Palle Yourgrau 2005 :D :D :D :D When Einstein Walked with G...
by kenbrooker
Wed Jan 23, 2019 7:11 am
Forum: News, Suggestions, and FAQ
Topic: Weird runtime behavior
Replies: 8
Views: 1807

Re: Weird runtime behavior

Thanks! rayfil ... "Assuming" I understand you right: 1) In the "Original" algorithm I was disregarding further processing of all even numbers, but only at the expense of first executing "else if(i % 2 == 0) return false;" for every even number, which, though relatively quick, I'm sure (You are way...
by kenbrooker
Tue Jan 22, 2019 6:13 pm
Forum: News, Suggestions, and FAQ
Topic: Weird runtime behavior
Replies: 8
Views: 1807

Re: Weird runtime behavior

Thanks LilStalker...

I agree the discrepancies are small but they are still in the Dead Wrong Direction to my way of thinking...

As you suggest I will try longer runtimes, possibly requiring BigInteger...