What it means
(f ∘ g)(x) means f(g(x)): apply g first, then f.
Read aloud in real formulas
(f ∘ g)(x) = f(g(x))
Aethel says
f composed with g, x, equals f of g of x
f after g
Typing it
- LaTeX
- \circ
- Unicode
- U+2218
Formulas that use it
Questions
How do you say ∘ out loud?
It is usually read “composed with”, and also “after”.
What does ∘ mean in maths?
(f ∘ g)(x) means f(g(x)): apply g first, then f.
How do you type ∘?
In LaTeX, write \circ. Its Unicode code point is U+2218.