What is the main philosophy of the pre-Socratic era?
They emphasized the rational unity of things and rejected supernatural explanations, seeking natural principles at work in the world and human society. The pre-Socratics saw the world as a cosmos, an ordered arrangement that could be understood via rational inquiry.
What makes a philosopher a pre-Socratic?
The Pre-Socratic Philosophers are defined as the Greek thinkers who developed independent and original schools of thought from the time of Thales of Miletus (l. c. 546 BCE) to that of Socrates of Athens (470/469-399 BCE). They are known as Pre-Socratics because they pre-date Socrates.
What kind of questions did pre-Socratics ask?
The Pre-Socratic philosophers rejected traditional mythological explanations for the phenomena they saw around them in favor of more rational explanations. They started to ask questions like where did everything come from, and why is there such variety, and how can nature be described mathematically?
What are pre-Socratics common themes?
The Milesians and the pluralists were primarily interested in natural philosophy—in the topics that we today would call physics, cosmology, and biology. Xenophanes, Heraclitus, and Parmenides, however, also had another preoccupation. They were interested in epistemology, or the study of knowledge.
Which pre Socratic philosopher said that reality was one and that nothing changes?
Heraclitus (c. 540–c. 480 BCE) argued that an ever-changing world around us is held together through a unifying principle that he called the logos.
What is pre Socratic era?
Pre-Socratic philosophy is the period of Greek philosophy up to the time of Socrates. It conventionally begins with the work of Thales (sixth century BC). The Sophists (active around the time of Socrates) are generally included as Pre-Socratic in that their work is not influenced by Socrates.
What are the two main themes or concerns of the milesian philosophers?
The traditional understanding of Heraclitus’s obscure philosophy is that it has two main themes, one of which is a problem that he poses, and the other is his solution to the problem. The problem is that everything in the world is continually changing.
Who was the pre Socratic philosopher before Socrates?
Pre-Socratic philosophy is ancient Greek philosophy before Socrates and schools contemporary to Socrates that were not influenced by him.
Who are the main sources for presocratic philosophy?
In some cases, these sources were themselves able to consult the works of the Presocratics directly. In many others, the line is indirect and often depends on the work of Hippias, Aristotle, Theophrastus, Simplicius, and other ancient philosophers who did have direct access.
Who are some famous people influenced by pre Socratic philosophy?
Both Plato and Aristotle were deeply influenced by pre-Socratics. Aristotle discussed pre-Socratics at his first book of Metaphysics , as an introduction to his own philosophy, in a quest of archai  He was the first to consider that philosophy starts with Thales. 
Which is the best book on the Presocratics?
The most standard book compiling the Greek fragments of Presocratics with very clear commentary. Indispensable for an understanding of the presocratics. Good Philosphy book.