The view that only minds really exist and that the physical world could not exist unless some mind were aware of it is known as materialism.
A kind of philosophical monism known as materialism maintains that matter is the primary component of nature and that all phenomena, including mental states and consciousness, are the products of material interactions. Philosophical materialism holds that the existence of mind and consciousness depends on material processes, such as the biochemistry of the brain and nervous system, and views them as epiphenomena or by-products of such processes. This idea contrasts sharply with idealism, which holds that material interactions are secondary and that mind and awareness are first-order realities to which matter is subject. Physicalism, the belief that everything in the universe is ultimately physical, is closely related to materialism.
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