Thymaridas of Paros (ca. 400 BCE  ca. 350 BCE) was an ancient Greek mathematician and Pythagorean noted for his work on prime numbers and simultaneous linear equations.
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Although little is known about the life of Thymaridas, it is believed that he was a rich man who fell into poverty. It is said that Thestor of Poseidonia traveled to Paros in order to help Thymaridas with the money that was collected for him.
Iamblichus states that Thymaridas called prime numbers "rectilinear" since they can only be represented on a one dimensional line. Nonprime numbers, on the other hand, can be represented on a two dimensional plane as a rectangle with sides that, when multiplied, produce the nonprime number in question. He further called the number one a "limiting quantity", or as we might say a "limit of fewness".
Iamblichus in Introductio arithmetica tells us that Thymaridas also worked with simultaneous linear equations.^{[1]} In particular, he created the then famous rule that was known as the "bloom of Thymaridas" or as the "flower of Thymaridas", which states that:
If the sum of n quantities be given, and also the sum of every pair containing a particular quantity, then this particular quantity is equal to 1/(n + 2) of the difference between the sums of these pairs and the first given sum.^{[2]}
or using modern notation, the solution of the following system of n linear equations in n unknowns,^{[1]}
x + x_{1} + x_{2} + … + x_{n−1} = s
x + x_{1} = m_{1}
x + x_{2} = m_{2}
.
.
.
x + x_{n−1} = m_{n−1}
is given by
Iamblichus goes on to describe how some systems of linear equations that are not in this form can be placed into this form.^{[1]}

