AlgebraicNumber[\[Theta], {c_0, c_1, ..., c_n}] represents the algebraic number in the field \[DoubleStruckCapitalQ][\[Theta]] given by c_0 + c_1 \[Theta] + ... + c_n ...
AlgebraicNumberNorm[a] gives the norm of the algebraic number a.
Algebraics represents the domain of algebraic numbers, as in x \[Element] Algebraics.
Alignment is an option which specifies how the contents of a displayed object should be aligned within the available area in the object.
All
(Built-in Mathematica Symbol) All is a setting used for certain options. In Part and related functions, All specifies all parts at a particular level.
AllowGroupClose is an option for Cell that specifies whether a cell group can be closed normally.
AllowInlineCells is an option for cells that specifies whether inline cells are permitted within a cell.
AllowReverseGroupClose is an option for Cell that specifies whether a cell group can be reverse closed.
AllowScriptLevelChange is an option for fractions and grids that controls whether certain operators, such as \[Sum], \[Product], and \[Integral], always appear smaller than ...
AlternativeHypothesis is an option for hypothesis testing functions like LocationTest that specifies the alternative hypothesis.