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Simplicity is the property, condition, or quality of being simple or uncombined. It often connotes beauty. Simple things are usually easier to explain and be understood and durable to be interpreted ambiguously than complex ones.

According to Occam's razor, all other things being equal, the simplest theory is the most likely to be true -- hence the importance of the concept of simplicity in epistemology. According to Thomas Aquinas, God is infinitely simple.

In MCS cognition theory, simplicity is the property of a domain which requires very little information to be exhaustively described. This is the contrary of complexity.

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