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The result is..?

Posted 10 years ago

Hi! I've this expression 6:2(2+1) and, I think, the result is 9. About wolfram's opinion, the result is 1. If I put 6/2(2+1) the result is 9.. so the 6:2(2+1) is like a proportion?

POSTED BY: edoardo di paolo
7 Replies
POSTED BY: Marco Thiel

I assume that you are putting this into WolframAlpha. And I assume that your colon is meant to indicate a ratio. If so, the reason why you get the answer that you do is because of the precedence of how WolframAlpha is interpreting your expression. It is interpreting it as the ratio between 6 and 2(2+1) which indeed is 1.

http://www.wolframalpha.com/input/?i=6%3A2%282%2B1%29

If you us brackets to indicate that you in fact want the result of the ratio between 6 and 2 then multiplied by (2+1) then you have to put brackets around the 6:2 as in (6:2)(2+1) which is indeed 9

http://www.wolframalpha.com/input/?i=%286%3A2%29%282%2B1%29

POSTED BY: David Reiss
POSTED BY: Sean Clarke

You beat me to it as I was typing ;-)

POSTED BY: David Reiss

Though it gets used as the "quotient-by-ideal" operator in algebraic geometry.

And there is it's appearance in the famous Fitzwillian Inn rebus: (!)

im = Import["https://www.cardcow.com/images/set190/card00288_fr.jpg"]

enter image description here

Unfortunately this one has been replaced of late by:

newimage = Import["http://www.minervaclassics.com/railroad/WEAFitz03b.jpg"]

I will not actually show the newer one. Out of protest, I guess.

Here is a coding challenge. One can zoom in, more or less, on the (original) rebus from the picture as below. But I'm sure it could be done much better, possibly by some rotation magic to move the right side more forward for example.

im2 = Sharpen[ImageResize[ImageCrop[im, {130, 90}], {300, 300}], 15]

enter image description here

POSTED BY: Daniel Lichtblau

In Germany I would always have used : to mark division; perhaps Leibniz's influence. Here in the UK it is usually / , I guess.

There is a nice summary of mathematical symbol use here.

Cheers,

Marco

POSTED BY: Marco Thiel

What does 6:2(2+1) mean? What operator is : supposed to be? what is the result of 6:2 supposed to be? I do not think I've seen : used in Mathematica before and I have 10.3. I've seen it in Matlab though.

POSTED BY: Nasser M. Abbasi
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