Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

Another page for your perusal and comment: Intervals

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,739

Hi MathsisFun;

Explains it nicely. I can not improve on it.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

Yep, another nice page.

It might be worth mentioning that an "outward facing" square bracket is sometimes used instead of a round one for open intervals.

eg. (0,1) = ]0,1[

() is my preferred notation though.

Why did the vector cross the road?

It wanted to be normal.

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