72  Usages of Unicode symbols

Julia allows the use of Unicode symbols to replace variable names and for function calls. Unicode operations are entered in this pattern \name[tab]. That is a backslash, \, the name (e.g., alpha), and then a press of the tab key.

In these notes, the following may appear as variable or function names

\Name	Symbol	Usage notes
\euler	ℯ	The variable e
\pi	π
\alpha	α
\beta	β
\delta	δ
\Delta	Δ	Change, as in Δx
\gamma	γ
\phi	ϕ
\Phi	Φ	Used for parameterized surfaces
x\_1	x₁	Subscripts
r\vec	r⃗	Vector annotation
T\hat	T̂	Unit vector annotation

The following are associated with derivatives

\Name	Symbol	Usage notes
\partial	∂
\nabla	∇	del operator in CwJ package

The following are infix operators

\Name	Symbol	Usage notes
\circ	∘	composition
\cdot	⋅	dot product
\times	×	cross product

Infix operators may need parentheses due to precedence rules. For example, to call a composition, one needs (f ∘ g)(x) so that composition happens before function evaluation (g(x)).