Parmenides and Heraclitus had fundamentally different views on the nature of reality, and it is unclear how Parmenides specifically reacted to Heraclitus' philosophy.
Heraclitus believed in a world of constant change and flux, where everything was in a state of perpetual motion and transformation. Parmenides, on the other hand, argued that reality is unchanging and eternal, and that the world of appearances is an illusion.
Some later philosophers have suggested that Parmenides' philosophy can be seen as a direct response to Heraclitus' views. Parmenides' emphasis on the unity and immutability of being can be seen as a rejection of Heraclitus' belief in constant change.
However, there is little direct evidence of how Parmenides specifically reacted to Heraclitus' philosophy. It is possible that he was influenced by Heraclitus' ideas, or that he saw them as a challenge to his own philosophical views. Nonetheless, Parmenides' philosophy remains an important contribution to the field of metaphysics and ontology, and continues to be studied and debated by philosophers to this day.
