Discrete Math, Negation and Proposition

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I hope we are all well.

I'm having a little hard time understand what negation means in Discrete maths.

Say I have "$2+5=19$" this would be a "Proposition" as its false. So how would I write the "negation". Would I say something like "$2$ plus $5$ does not equal $19$"?

The dictonary definition is: the absence or opposite of something actual or positive.

Thanks, Ben.

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