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In philosophy and specifically metaphysics, the theory of Forms, theory of Ideas, [1] [2] [3] Platonic idealism, or Platonic realism is a theory widely credited to the Classical Greek philosopher Plato. The theory suggests that the physical world is not as real or true as "Forms".
The Form of the Good, or more literally translated "the Idea of the Good" (ἡ τοῦ ἀγαθοῦ ἰδέα [a]), is a concept in the philosophy of Plato.In Plato's Theory of Forms, in which Forms are defined as perfect, eternal, and changeless concepts existing outside space and time, the Form of the Good is the mysterious highest Form and the source of all the other Forms.
Within Plato's hierarchy of Forms, the many lower-level Forms of the species derive from and depend on the higher and more general Forms of each genus. This leads to the supposition that the introduction of Forms was only a step on the way from the maximum multiplicity of appearances to the greatest possible unity.
In Plato's Republic, the character of Socrates is highly critical of democracy and instead proposes, as an ideal political state, a hierarchal system of three classes: philosopher-kings or guardians who make the decisions, soldiers or "auxiliaries" who protect the society, and producers who create goods and do other work. [1]
There were three periods: the Old, Middle, and New Academy. The chief figures in the Old Academy were Speusippus (Plato's nephew), who succeeded him as the head of the school (until 339 BC), and Xenocrates (until 313 BC). Both of them sought to fuse Pythagorean speculations on number with Plato's theory of forms.
Plato's most self-critical dialogue is the Parmenides, which features Parmenides and his student Zeno, which criticizes Plato's own metaphysical theories. Plato's Sophist dialogue includes an Eleatic stranger. These ideas about change and permanence, or becoming and Being, influenced Plato in formulating his theory of Forms. [54]
In philosophy, Plato's epistemology is a theory of knowledge developed by the Greek philosopher Plato and his followers. Platonic epistemology holds that knowledge of Platonic Ideas is innate, so that learning is the development of ideas buried deep in the soul, often under the midwife-like guidance of an interrogator.
This is a reference to Plato's belief that all particular things are only shadows of eternal Forms. Only the philosopher, therefore, is qualified to rule, as only the philosopher has knowledge of the absolute truth and is able to apply this knowledge for the good of the state. [4]