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- August 15th 2012, 11:09 AM #1

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## A?B

I know this is probably really simple. However, I've searched and searched online and in my book and I cannot figure out what the question mark means. I figure that it must be a substitute for another symbol since I cannot find it anywhere. Can someone tell me what the meaning of the question mark is in A?B

- August 15th 2012, 11:13 AM #2

- August 15th 2012, 11:15 AM #3

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- August 15th 2012, 11:32 AM #4

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## Re: A?B

The empty boxes? I see subset signs! If you saw that on a website then the "?" are symbols your web browser did not recognize. You are told that Z (the set of all integers) is a subset of Q (the set of all rational numbers) but that the converse is not true. 0 and 1 are integers and question is, are they rational numbers.

- August 15th 2012, 11:36 AM #5

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- August 15th 2012, 12:07 PM #6

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## Re: A?B

This depends not so much on the browser as on the font you are using. Arial Unicode MS and DejaVu Sans are two fonts that have pretty good coverage of mathematical symbols (I don't have Arial Unicode right now, but that's what I remember). In desktop Firefox, for example, you can change font in Tools | Preferences | Content.