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existence

Overview page. Subjects: Philosophy.

For the question of why there is something and not nothing, see being. The modern treatment of existence in the theory of quantification is sometimes put by saying that existence is not a...

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exportation

Overview page. Subjects: Philosophy.

An operator is exported from a place within a sentence if it is repositioned so that the whole of the rest of the sentence is within its scope. This may or may not give an equivalent...

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gradient operator

Overview page. Subjects: Physics.

The operator

∇ = i∂/∂x + j ∂/∂y + k ∂/∂z,

where i, j, and k are unit vectors in the x, y, and z directions. Given a scalar function f and a unit vector n, the scalar...

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scope

Overview page. Subjects: Philosophy.

Intuitively the scope of an operator is the part of an expression over which it holds its effect. The scope of ‘+’ in ‘(3+5)×7’ would be the sum in the brackets, whereas the scope of ‘×’ is...

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sentential operator

Overview page. Subjects: Philosophy.

Any operator that takes a sentence as its argument, usually to deliver another sentence.

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