The phrase "external existence" is grammatically correct and can be used in written English.
It refers to things or phenomena that exist outside of one's own mind or consciousness. Example: Many philosophers debate the concept of external existence, questioning whether the physical world truly exists independently of our perception of it.
But as hard as she tries, Karin can't stop feeling the pull of the shadow world inside her, a world that starts to seem more real than any external existence.
This idea survived to a certain extent in Coleridge's classification; he stated that grammar and logic provide the rules of speech and reasoning, while mathematics presents truths that are applicable to external existence.
Foucher had objected that Malebranche has no good reason to affirm the external existence of these properties.
The best one can do to make sense of external existence questions is to re-construe them as pragmatic questions as to which frameworks to accept.
The infant feels confident in asserting its independence, and destroying its object in fantasy, so long as that object is discovered to have a secure external existence in reality.
Together with the distinction between mental and external existence (or existence in concrete individuals: fī l-ʿayān) Avicenna posits a distinction between the being of the thing and its existence.
The situation may parallel that of the existence of an external world, the existence of other minds, and a number of other familiar matters.
As Diderot later pointed out in his Letter on the Blind, for Condillac to rest his case against scepticism about the existence of an external world on such facile grounds was to ignore the powerful reasons for denying the existence of material things that had been articulated by Berkeley.
chap. 1, 8) there is for him no basis on which to found any metaphysical claims to the real existence of an external world or any epistemological basis for claiming knowledge of the real constitution of a subject-independent world or its real existence.
Because of his commitment to realism (minimal though it may have been) Kant was disturbed by Berkeley's uncompromising idealism, which amounted to a denial of the existence of the external world.
