Is there a symbol / {some number} in mathematics when describing D(f)?

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Conan_Doyle2019-09-04 21:28:55

Mathematics

Conan_Doyle, 2019-09-04 21:28:55

Is there a symbol / {some number} in mathematics when describing D(f)?

What is it called / {some number}?
For example:
y = (15x+2)/x
D(f) = x ∈ R / {0}
same:
D(f) = x ≠ 0

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