wu :: forums « wu :: forums - Has anyone seen this before? » Welcome, Guest. Please Login or Register. Apr 18th, 2024, 2:28am

RIDDLES SITE WRITE MATH! Home Help Search Members Login Register

wu :: forums    general    truth (Moderators: Eigenray, Grimbal, SMQ, william wu, ThudnBlunder, towr, Icarus)    Has anyone seen this before? « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: Has anyone seen this before?  (Read 7869 times) Benny Uberpuzzler     Gender: Posts: 1024 Has anyone seen this before?   « on: May 7th, 2009, 5:30pm » Quote Modify I came across quite accidentally this forum where it discusses   http://eqworld.ipmnet.ru/forum/viewtopic.php?f=3&t=128     I'm not familiar with "structural geometry"   Then, on the same site, I found at     http://eqworld.ipmnet.ru/forum/viewtopic.php?f=3&t=143   y = x2 + 16   y' at x=3   the author finds y'= 10 ... it's quite extraordinary! Okay, this result is bogus. But what about the so-called "structural geometry" at the first link ? IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Has anyone seen this before?   « Reply #1 on: May 8th, 2009, 12:12am » Quote Modify There's probably a reason why all replies in that thread are spam. It's not clear what he's trying to do, nor are his equations even correct in many cases. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Noke Lieu Uberpuzzler pen... paper... let's go! (and bit of plastic)     Gender: Posts: 1884 Re: Has anyone seen this before?   « Reply #2 on: May 8th, 2009, 1:03am » Quote Modify It's awesome- it's like a ghost town or something. ) registered users, 1 guest, when I looked. IP Logged a shade of wit and the art of farce. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #3 on: Jun 29th, 2009, 12:15pm » Quote Modify We start with 2 The second digit is twice the first, the third is twice the second, etc., with "carries" added in as we go along ... and then we stop when we find a number starting with 10.   ................................2                   ..............................42                   ............................842                 ........................16842               ......................136842               ......................736842                               ..................14736842                     ..................94736842                   ..............1894736842                           ............17894736842                         ..........157894736842                         ........1157894736842                         ........3157894736842                         ......63157894736842                       ...1263157894736842                       ...5263157894736842                     105263157894736842       Moving the last 2 to the front gives 210526315789473684, manifestly twice 105263157894736842.   This blog also contains Dr. Mutalik's explanation of the phenomenon in terms of arithmetic mod 19. « Last Edit: Jun 29th, 2009, 12:22pm by Benny » IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Has anyone seen this before?   « Reply #4 on: Jun 29th, 2009, 12:34pm » Quote Modify http://en.wikipedia.org/wiki/Parasitic_number IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #5 on: Jun 29th, 2009, 1:23pm » Quote Modify on Jun 29th, 2009, 12:34pm, towr wrote: http://en.wikipedia.org/wiki/Parasitic_number   Thanks for the link. These numbers are intriguing. IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #6 on: Jul 14th, 2009, 12:08pm » Quote Modify Has anyone done this experiment:   http://www.youtube.com/watch?v=UB1vd8614gg     IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. TenaliRaman Uberpuzzler I am no special. I am only passionately curious.     Gender: Posts: 1001 Re: Has anyone seen this before?   « Reply #7 on: Jul 14th, 2009, 1:25pm » Quote Modify http://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction#Data_ storage   -- AI IP Logged Self discovery comes when a man measures himself against an obstacle - Antoine de Saint Exupery Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #8 on: Sep 18th, 2009, 2:57pm » Quote Modify Binary Clock   It has a detail PDF document IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #9 on: Sep 28th, 2009, 2:09pm » Quote Modify Have you seen this book : A = B?     IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #10 on: Oct 13th, 2009, 1:55pm » Quote Modify The Book of Odds is an online statistical encyclopedia.   The Book of Odds is a searchable online database of “odds statements,” the probabilities of everyday life. IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #11 on: May 12th, 2010, 7:14pm » Quote Modify I've just read the following: The sum of digits of prime numbers is evenly distributed IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #12 on: Sep 8th, 2010, 10:44pm » Quote Modify Furstenberg's Proof of the Infinitude of Primes   Quote: Perhaps the strangest is the following topological proof by Fürstenberg   http://primes.utm.edu/notes/proofs/infinite/topproof.html   What makes this proof so strange? IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. rmsgrey Uberpuzzler     Gender: Posts: 2872 Re: Has anyone seen this before?   « Reply #13 on: Sep 9th, 2010, 7:25am » Quote Modify on Sep 8th, 2010, 10:44pm, BenVitale wrote: Furstenberg's Proof of the Infinitude of Primes     http://primes.utm.edu/notes/proofs/infinite/topproof.html   What makes this proof so strange? If you look at the other proofs listed on that site, they are all couched in the language of arithmetic. They talk about taking a list of distinct primes (or a list of numbers that represent distinct primes), performing arithmetic operations on them, and producing a number that represents a new prime.   The topological proof is, unsurprisingly, couched in the language of topology, so, while it's actually saying pretty much the same thing as the other proofs - that no finite set of primes can cover the integers with their multiples - there will always be some numbers that aren't divisible by any of the primes in the set, it's saying it in an unusual way.     Also, it's a non-constructive existence proof - it doesn't tell you anything about how to find these non-multiples, just that they must exist - the other proofs all tell you where to look for your new prime. IP Logged Benny Uberpuzzler     Gender: Posts: 1024 Re: Has anyone seen this before?   « Reply #14 on: Nov 30th, 2011, 2:42pm » Quote Modify A regular expression to check for prime numbers   http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check- for-prime-numbers/   IP Logged If we want to understand our world — or how to change it — we must first understand the rational choices that shape it. towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: Has anyone seen this before?   « Reply #15 on: Nov 30th, 2011, 10:11pm » Quote Modify It actually checks for non-primes And it's a bit irregular for a regular expression, since you can't translate it to a finite state machine. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook => truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

Powered by YaBB 1 Gold - SP 1.4!
Forum software copyright © 2000-2004 Yet another Bulletin Board