Aristotle, in his treatise 'On the Heavens', discussed in books I-II the problem of universe's indestructibility from philosophical point of view. He put forward following arguments: a body in which no change is perceived has no disposition for the change and persists continuously in the same state. The cause of bodies' perpetuity is an actualised by form a potentiality as a matter. Thus, everything what is always indestructible and ingenerated exists directly and is a being.
The subject matter of this dissertation includes the aspects of complex bodies i.e. mixed one in Aristotle's treaty 'On Coming-to-be and Passing-away'. The essence of the complex body is the formal cause updating it and indicating the state of the organization of elements, along with the material cause (elements). The essence form of a complex body differs form the essence form of its elements. Complex bodies are created by means of mixing elements. The mixture of the elements is a merger of its ingredients that have been mixed.
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