Opening (Built-in Mathematica Symbol)

Opening[image, ker] gives the morphological opening of image with respect to the structuring element ker.Opening[image, r] gives the opening with respect to a range r square.

OptionInspectorSettings (Built-in Mathematica Symbol)

OptionInspectorSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies the display of options in the Option Inspector.

Order (Built-in Mathematica Symbol)

Order[expr_1, expr_2] gives 1 if expr_1 is before expr_2 in canonical order, and -1 if expr_1 is after expr_2 in canonical order. It gives 0 if expr_1 is identical to expr_2.

OutputStream (Built-in Mathematica Symbol)

OutputStream["name", n] is an object that represents an output stream for functions such as Write.

OverBar (Built-in Mathematica Symbol)

OverBar[expr] displays with a bar over expr.

Overlaps (Built-in Mathematica Symbol)

Overlaps is an option to StringCases, StringCount, and StringPosition that specifies how to treat overlapping substrings.

Overscript (Built-in Mathematica Symbol)

Overscript[x, y] is an object that formats as OverscriptBox[x, y].

PassEventsDown (Built-in Mathematica Symbol)

PassEventsDown is an option to EventHandler which specifies whether events handled by a particular event handler should be passed down to event handlers nested inside.

PatternSequence (Built-in Mathematica Symbol)

PatternSequence[p_1, p_2, ...] is a pattern object which represents a sequence of arguments matching p_1, p_2, ....

PlayRange (Built-in Mathematica Symbol)

PlayRange is an option for Play and related functions which specifies what range of sound amplitude levels should be included.