Masking
(Built-in Mathematica Symbol) Masking is an option for various image analysis and processing functions that specifies on which regions they should operate.
Cos
(Built-in Mathematica Symbol) Cos[z] gives the cosine of z.
Sin
(Built-in Mathematica Symbol) Sin[z] gives the sine of z.
GroupElementQ[group, g] returns True if the object g is an element of group and False otherwise.
GroupOrder[group] returns the number of elements of group.
RangeFilter[image, r] filters image by replacing every pixel by the difference of the maximum and minimum in its range r neighborhood. RangeFilter[data, r] applies a range ...
StartScheduledTask[obj] starts the task represented by obj.
VertexOutComponent[g, {v_1, v_2, ...}] gives the vertices in the graph g that have a directed path from at least one of v_1, v_2, ....VertexOutComponent[g, {v_1, v_2, ...}, ...
When you do long calculations, it is often convenient to give names to your intermediate results. Just as in standard mathematics, or in other computer languages, you can do ...
FiniteGroupCount[n] gives the number of finite groups of order n.