∘
U+2218
,
&
#8728;
RING OPERATOR
←
∗
[U+2217]
數學運算子
∙
→
[U+2219]
跨語言
符號
(
數學
)
複合函數的符號
(
g
∘
f
)(
x
) =
g
(
f
(
x
))
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