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The year 435BCE, along with any year between 500BCE and 401BCE, occured during the fifth century BCE.
In the 4th century BCE.
17 centuries. From the last day of the 9th century BCE to the first day of the 9th century AD was just over 1600 years while From the first day of the 9th century BCE to the last day of the 9th century AD was just under 1800 years.
Irrational numbers were known in India around 7th Century BCE but there existence as a different class of number but they had not proved their existence. That is sometimes attributed to Hippasus, a Greek philosopher of the Pythagorean school in the 5th Century BCE.
The first one that we know of was called the Torah (תורה). It's date is unknown. Jewish tradition places it in the 13th century BCE, while modern scholarship suggests it was still an oral tradition until the time of King David, around the 10th century BCE.