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Is there notation for what is essentially when, for the situation, for example:

In the situation when x is 2, y is 21t (edited)

Sorry for being brief; if it lacks clarity, please leave a comment and I will amend it

Edit:

It's to keep my math notes tidy when I'm asked to write the acceleration when time is 0; I have to write this as words though I feel it's sloppy and I'm wondering if there's notation for this situation

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    Writing things in words is _not at all_ sloppy.2012-05-22

2 Answers 2

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$y(x)|_{x=5}=21t$ should do.

2

$(x,y) = (5,21t)$?

Hope that helps,