# What does this range notation mean: 0:01 < x < 10:0

I've got a homework problem which states "use a range of 0:01 < x < 10:0"

I'm thinking this would mean the range 0.00, 0.01, 0.02, ... 9.98, 9.99, 10.00

Has anyone seen this notation before that can tell me what this range would be?

Thanks, Joe

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Could you please describe the context of the problem? – Weltschmerz Aug 30 '11 at 2:10
Sure, here's the problem: Each of the following equations can be represented as a straight line on an x-y plot by choosing the appropriate axis scales. Plot them both in rectangular coordinate format and then in an appropriate format to yield a straight line. Explain how the plot operation yields the straight line. Variable y has units of volts. Variable x has units of meters (use a range of 0:01 < x < 10:0). Note: This is easily done using a spreadsheet program where you can compare the use of different axis scales. – Joe Blitzer Aug 30 '11 at 2:23
You might want to edit that into your question. That being said, I don't know why they're using ":"... – J. M. Aug 30 '11 at 2:32

## 3 Answers

I don't know what $0{:}01$ means, but if it means $0.01$ then what a range of $0{:}01<x<10{:}0$ means is that $x$ is greater than $0.01$ meters and less than $10$ meters. I suppose the $0$ is excluded so that you can take logarithms.

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This answer should be right. If I google something like "use a range of 0:01 < x", I get one of results "and x(0) = _x(0) = 0:1, solve the VdP system for h = 0:01", whereas in the referenced book this string is "and x(0) = _x(0) = 0.1, solve the VdP system for h = 0.01". Maybe it's some weird and rare OCR problem. – user3449173 Jun 3 '15 at 8:14

I think all it means is, when you plot your points, use only values of $x$ between $.01$ and $10$. But I am confused as to why someone would write $0{:}01$ and $10{:}0$ instead of $0.01$ and $10.0$.

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This is not the usual decimal symbol anywhere. Even in Europe they will use the comma instead (e.g. 0,05). This just means (0.01,10.00) not including the endpoints.

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