Evaluate numerically:

Complex number inputs:

Evaluate to high precision:

For real inputs, the result is exact:

For complex inputs, the precision of the output tracks the precision of the input:

Evaluate efficiently at high precision:

Arg threads elementwise over lists and matrices:

Arg can be used with Interval and CenteredInterval objects:

Values of Arg at fixed points:

Value at zero:

Values at infinity:

Exact inputs:

Evaluate for complex exponentials:

Find a value of x for which the Arg[I x]=π/2:

Visualize the result:

Plot the on the real axis:

Plot on the reals:

Plot over the complex plane:

Visualize Arg in three dimensions:

Use Arg to specify regions of the complex plane:

Arg is defined for all real and complex inputs:

Function range of Arg for real inputs:

Except on the negative reals, :

Arg is not a differentiable function:

The difference quotient does not have a limit in the complex plane:

There is only a limit in certain directions, for example, the real direction:

Use ComplexExpand to get differentiable expressions for real-valued variables:

Arg is not an analytic function:

It has both singularities and discontinuities:

Over the complex plane, it is singular everywhere and discontinuous on the non-positive reals:

Arg is nonincreasing:

Arg is not injective:

Arg is not surjective:

Arg is non-negative:

Arg is neither convex nor concave:

TraditionalForm formatting:

Expand assuming real variables x and y:

Simplify Abs using appropriate assumptions:

Express a non-zero complex number in term of its Arg and Abs:

is equal to :

Except for , :