Verify if 0.9999 is Equal to 1

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Is 0.9999... equal to 1?

I think it is, but there are several sources arguing that statement.

Could you verify this?
 
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https://www.physicsforums.com/showthread.php?t=507002 andhttps://www.physicsforums.com/showthread.php?t=507001
 
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Oh thank you, I hadn't realized that other people had posted this.
 

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