The universe is older than mankind and mankind evolved within the universe. So the universe could not be discovered.
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pi and the square root of two are mathematical constants. They are not functions of time and so cannot be plotted on a timeline!
Math And Arithmetic
The way to look at positive and negative numbers is to imagine them as if they are on a numberline. Positives will go up the timeline, and towards 100. Negatives will go down (to the left) of the timeline.
A sequence can be referred to as a string, a progression, a chain or a timeline.