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I'm just saying "D" because I can't immediately type the symbol here and it was easier just to use that. Not least, I didn't know if that was the formula you meant.

But as I say, immediately above the formula it says:

"For a pulse of width ∆t, the critical time ..."

So that really is saying exactly what that cluster of symbols means. There will be things like this everywhere as you read stuff. Things are rarely completely undefined, but you are expected to be reading along.

And you need to work. I just typed this into DDG:

"What does ∆t mean?"

The very first hit is this:

https://en.wikipedia.org/wiki/Delta_%28letter%29

That gives you a lot of context for what the symbol means, and this is the sort of thing you'll need to do. You need to stop, look at the thing you don't understand, read around in the nearby text, then type a question (or two, or three) into a search engine.




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