What Greek thinker or philosophical group first asserted that a mathematical harmony could be found in the universe's underlying structures?

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The Pythagoreans were a group of philosophers and mathematicians who believed in the idea of a universal harmony that could be found in numbers and geometrical shapes. They believed that this harmony extended to the universe's underlying structures and that everything in the universe could be expressed in terms of mathematical relationships. This belief was known as the Pythagorean doctrine and is considered to be one of the earliest expressions of a systematic approach to understanding the natural world.

What Greek Thinker or Philosophical Group First Asserted That a Mathematical