File > Printing Settings > Headers and ... (Mathematica Menu Item)

Headers and Footers sets options for printing a notebook.

Setting Up Functions with Optional ... (Mathematica Tutorial)

When you define a complicated function, you will often want to let some of the arguments of the function be "optional". If you do not give those arguments explicitly, you ...

UpSet (Built-in Mathematica Symbol)

lhs ^= rhs assigns rhs to be the value of lhs, and associates the assignment with symbols that occur at level one in lhs.

PermutationGroup (Built-in Mathematica Symbol)

PermutationGroup[{perm_1, ..., perm_n}] represents the group generated by multiplication of the permutations perm_1, ..., perm_n.

SetField (JLink Symbol)

SetField[obj@field, val] sets a value of an object field.

GroupGenerators (Built-in Mathematica Symbol)

GroupGenerators[group] returns a list of generators of group.

Union (Built-in Mathematica Symbol)

Union[list_1, list_2, ...] gives a sorted list of all the distinct elements that appear in any of the list_i. Union[list] gives a sorted version of a list, in which all ...

Algebraic Number Fields (Mathematica Tutorial)

Mathematica provides representation of algebraic numbers as Root objects. A Root object contains the minimal polynomial of the algebraic number and the root number—an integer ...

TagSetDelayed (Built-in Mathematica Symbol)

f /: lhs := rhs assigns rhs to be the delayed value of lhs, and associates the assignment with the symbol f.

RegionPlot (Built-in Mathematica Symbol)

RegionPlot[pred, {x, x_min, x_max}, {y, y_min, y_max}] makes a plot showing the region in which pred is True.