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Probably the ancient Egyptians who discovered that the diagonal of a unit square was not a rational number. And then discovered other such numbers.
An irrational number.
Pi is the value of a circle's circumference divided by its diameter and its true value has never been discovered because it is an irrational number
There is no first irrational number. Irrational numbers are infinitely dense which means that there are infinitely many of them in any interval. So if any number laid claim to being the first, there would be infinitely many that would be between 0 and that number. Each one of them would then have a better claim to be "first".
When added to a rational number, any irrational number will produce an irrational number.also, when added to an irrational number, any rational number will produce an irrational number.