What argument did Gorgias make about existence knowledge and communication?

In his work Peri tou mē ontos ē peri physeōs (On That Which Is Not, or On Nature), the Greek Sophist Gorgias of Leontini presented a famous three-part argument regarding the nature of reality and human understanding. He argued:12

• Nothing exists: He challenged the metaphysical claims of his predecessors by asserting that nothing truly exists.12
• Knowledge is impossible: He maintained that even if something were to exist, it would be incomprehensible or unknowable to the human mind.12
• Communication is impossible: He concluded that even if something were both existent and knowable, it could not be communicated to another person.12

While these claims have often led to accusations that Gorgias was a nihilist or a radical skeptic, many scholars suggest his work was intended as a critique of Eleatic philosophy or a satire against philosophers who attempted to assign existence or nonexistence to metaphysical principles beyond observable phenomena. Rather than denying the validity of sense perception, Gorgias likely aimed to reject the attempt to explain the physical world through principles that cannot be perceived by the senses.312