Wikipedia:Reference desk/Archives/Mathematics/2011 July 28

= July 28 =

Value of the world's hoarded coins
Greetings all. I don't visit this desk often. Math isn't something I probably grep past simple, square arithmetic, but I understand (I think) that $$Big Math$$ is numbers and the things they represent ((whe{rn}+/-^e) applicable) working out simple, square arithmetic over and over again, with different applications reducing anomalies into the equation until they fit with >>Reality<<, so I ask this question here, instead of Humanities or Computing (which desk I also tend not to frequent) where it might also go.

This, also, is my first question to any of the WPRef desks, since I like to think I'm smart, and toss in my ₡10.0553042 to show it every now and then & consider myself xth above equals. So I'm humbled.

My question is this: what is the value of all the coins that each person currently living on Earth hoards. By hoard I mean keep in physical form accessible without too much effort -- a jar, a book, a safe or safe deposit box, a drawer, a rafter, &c are all places one might hoard -- for some reason. The reasonings I'm thinking would be along the lines of 'valuable now, & always will be,' "not valuable here, but valuable elsewhere," "not valuable now, but possibly valuable later", 'not valuable here or elsewhere, but interesting. Nice to have around.', &c. Valuable would mean it could be traded for some good, service, or physical currency of equal or higher value. In other words, what are the:
 * 1990 loonie
 * 1989 colón
 * 1965 quarter that must have fallen into a gearbox recently, or someone tried to make a slug out of it, or something; whatever it was, it's never going to go kindly into a coin machine ever again.
 * 1984 20 centime piece
 * 2005 €2
 * 1954 half crown

sitting in a teapot in Someplace USA worth, in $US, against the value of all coins in similar circumstances across the world?

It seems like there should have been some attempts to figure this out made, money counting being as popular as it is, but I've no idea how to search for them. Is there a way to sift all the variables down into something that functions, even within a certain sluggish margin of error, in >>the real world<<?

--some jerk on the Internet   (talk)  04:36, 28 July 2011 (UTC)


 * Perhaps you can get some indication of the incidence of hoarding by studying public statistics on how much pre-Euro currency remains in circulation. According to the Bundesbank there are Deutschmark coins worth 6.91 billion Dm in circulation as of mid-2011.  Assuming that the coins are mainly kept by German citizens, this means a hoarding rate on the order of 100 Dm per person. Of course the hoarding rate may vary in different cultures, and may be entirely different in the case of coins that are currently legal tender, but you've got to start somewhere.  188.117.30.209 (talk) 20:39, 31 July 2011 (UTC)
 * Thanks; this is just the kind of idea I was looking for. Finding numbers for the pre-Euro currencies still in circulation is a great start.  I was thinking I could also compare our list of circulating currencies against our list of historical currencies and try to dig out information there as well.  I guess the trick is to break the question down into reasonably manageable chunks, rather than trying to allow for every conceivable variable or possibility at once.  Thanks again.   --some jerk on the Internet    (talk)  13:50, 1 August 2011 (UTC)

what is remainder??:
what is remainder after this division: [(47)^43]/47.. and how..?? — Preceding unsigned comment added by 203.88.131.62 (talk) 06:40, 28 July 2011 (UTC)


 * Assuming you have copied the question correctly, this is very straightforward. Notice that 47^43 = (47^42) x 47. That should give you a big clue. Gandalf61 (talk) 07:49, 28 July 2011 (UTC)
 * [(47)^43]/47 is exactly 47^42 which is an integer, so the remainder is 0. Widener (talk) 10:46, 29 July 2011 (UTC)

Diagrams for Young Tableau
How do we import or create diagrams for Young Tableau in a Wikepedia article?--Profvk (talk) 07:02, 28 July 2011 (UTC)
 * Go to Special:Upload and follow the instructions there. Then go to the article and insert the picture as Name.jpg .  Rcsprinter  (talk)  10:48, 28 July 2011 (UTC)
 * I think I might just use tables and forget about special images. Dmcq (talk) 17:19, 28 July 2011 (UTC)
 * There's a LaTeX package, youngtab, which does some nice Young tableaux. Sadly it doesn't do polytabloids (row or column), but you can make them by editing an outputted PDF file. Then you can convert to an image, say SVG. It would be nice if they could add the Youngtab package as part of the LaTeX system, but I'm sure it could get out of hand with everyone recommending their own package, and having to debug compatibility problems. --SamTalk 19:56, 28 July 2011 (UTC)

name of series
What is the name of this series which defines y? a=1 to infinity y=x^(a/a+1) --DeeperQA (talk) 15:32, 28 July 2011 (UTC)
 * The question doesn't make any sense. If "series" means an infinite sum, it will not converge.  If "series" means a limit, the limit is just y = x. Looie496 (talk) 17:21, 28 July 2011 (UTC)


 * It may be y=y+(a/a+1), with either a=1 to infinity or a=0 to 1. I saw "series" but the power was out and all I had were matches. I left my magnifier at home. --DeeperQA (talk) 19:49, 28 July 2011 (UTC)
 * You're still not making any sense... --Tango (talk) 21:33, 30 July 2011 (UTC)

Let's remember to not bite people posting questions. A person wouldn't need to post a question if s/he understood all of the concepts and vocabulary. We're here to help people; not to judge them. To DeeperQA, could you take another look, and try to give us the question another time? At the moment it's hard to understand what you're asking. Take a look at our sequence and series articles too. They might help you to phrase the question. Also, maybe include a reference to the place that you found the problem. — Fly by Night  (  talk  )  03:45, 31 July 2011 (UTC)

Converting dollars to Indian money
i want to know how to convert 1 ounce gold from us dollar to indan money in full fromul — Preceding unsigned comment added by 117.207.113.247 (talk) 17:14, 28 July 2011 (UTC)
 * At today's conversion rate, multiply by 44 to get the value in rupees→86.155.185.195 (talk) 19:05, 28 July 2011 (UTC)