math

I was looking through some old books on business, and noticed that the information was very outdated, pre computer days etc. The mathematical ratios used to analyze revenues, expenses/other business related data were the same as is used today, but were never more advanced than one or two...

To me, 7*5 is 14, 28+7=35 6*6 is 18, 36 I can hear myself say those words in my head. I still picture those groups of dots from grade school sometimes. Anybody else do this?

Women Lack 'Natural Ability' In Some Fields, Harvard President Says CAMBRIDGE, Mass -- The president of Harvard University prompted criticism for suggesting that innate differences between the sexes could help explain why fewer women succeed in science and math careers. Lawrence H. Summers...

(It's late at night so I apologize for rambling and some strange sentence structure. Hopefully you can sift through it and find some use in the post.) I've been thinking the past few months about natural selection, and how most of the ideas we have today must serve some important purpose to...

Just curious what you guys (and gals) think.. is mathematics a real, measurable phenomenon or is it logically incompatible with what we know about physical reality? The point that confuses me the most is that mathematics seems to be such a natural way of understanding many different aspects of...

Prove that inverse fourier of (rect(w/z) x e^(-w/b))= z sinc (zt + iz/b) Assume that w in the frequency domain translates to t in the time domain. The way I am approaching this problem is by using the following property: F(f1 x f2) = F(f1) * F(f2), convolution property I know what the...

No Message ...go on, savage logic !

What exactly are the chances of getting 3 aces on the flop, and me having the last ace in the deck?

Well, everyone else is also certaily welcomed to comment too: We all know that the accepted answer to the square root of negative one is i; and that this begins a numberline perpendicular to the Real Number numberline (Imaginary Numbers). But just exactly what is defined as being the square...

Can anyone give examples of things that are "miraculous" in mathematics? By "miraculous", I guess I mean things that are generally impossible in the real world, but possible in the mathematical world. Here are my examples: --one can fit an object with any length or height in the diagonal of a...

I was channel surfing the other day and came across that scene in "Good Will Hunting" where the main character is working on a mysterious looking math problem as seen in the pic below. I was wondering if this is real math or just something that they made up.

My son is studying volumes of solids. All his homework last week and this week is on that subject. In the middle of this evening's homework is this gem: WTF? My first reaction was that the person writing the problem does not realize that the volume of the boxes is irrelevant. Then I figured I...

Here is an interesting math problem. You have a perfect, solid sphere. You drill a cylindrical hole completely through the center of the sphere, from one side to the other. What is left looks like a bead, with the end caps removed. The hole is 6 inches long from end to end. What is the...

John Allen Paulos proposes a math quiz for presidential candidates. I will say that, on the "reasoning" part, in which computation or mathematical reasoning was involved, I did very well. In fact, I answered all of these questions correctly. I used a calculator for some of the computation...

http://digicc.com/fido/

...because I wouldn't know where to begin. How many miles would 10 feet seem to be to a person shrunk to 1/25 inches tall? How mank kilometers would 10 meters seem to a person shrunk to 0.1 mm tall?

Someone on another Forum posted this question and for some reason I get the answer. What do you guys think? When physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 10% of its normal value due to plaque formation, and...

I ran across this 'joke' on the internet this morning. I can't figure out what the 'trick' is. At first glance, I thougt it was the old 'division by zero' trick but it doesn't look like that's it. What am I missing? :confused: I know I'll kick myself when I see what it is.

I was considering putting these questions on sci.math but I thought I'd try here first: I am aware of Euler's formula V+R-L=1 which applies to any network, but not much else. Consider that each connection in a network has a finite bandwidth (like say a water pipe network, or a road traffic...

Here is one of those funny (not really) math jokes I heard years and years and years ago: Three businessmen walk into a hotel. The hotel clerk tells them that their stay will cost US$30. The three businessmen agree to split the cost equally, they each pay US$10. When the men arrive at their...

I'm sure that a full-text virtual collection of more than 2,000 volumes of mathematical textbooks, dissertations and other monographs has a very limited audience, but here's a link for anyone who might be interested: Cornell University Library Historical Mathematics Monographs

1. Can you have a dot product for two matrices that are NOT vectors and NOT identical dimensions? Everything I've seen suggests that only vector matrices with exactly the same dimensions can be used in a dot product. If thats not true, how would find the dot product of [1, 2; 3, 4] with [5...

The discussion of Euler's formula last week fascinated me and prompted me to do some research on my own. I found this page: http://members.ispwest.com/r-logan/ Notice that at the end of the document, it turns into a surreal collection of Bible verses. Weird, huh? I have several questions: Is...

My (recently former) roomate and I have a disagreement on bills. There are three of us, and one of us moved out this month after 2 weeks. He says his share of the bills should be calculated like this: Working independently, I came up with the following: Obviously, I want him to be correct...

LOL :D The New Intellectual has brought some staggering revelations to light: - zero is an invalid number, and we need to devise a new ruler since our numbering system has been "falsified by natural man" - the Pythagorean theorem is wrong ... and a host of other crazoid garbage. I haven't...