AnimationRepetitions is an option to Animate and related functions that specifies how many times the animation they create runs before stopping.

AnimationRunning is an option to Animate and related functions that specifies whether the animation they create is running.

Animator[u] represents an object that displays with the value of u being continually increased from 0 to 1 with time. Animator[u, {u_min, u_max}] makes u vary from u_min to ...

Annuity[p, t] represents an annuity of fixed payments p made over t periods.Annuity[p, t, q] represents a series of payments occurring at time intervals q.Annuity[{p, ...

Apart[expr] rewrites a rational expression as a sum of terms with minimal denominators. Apart[expr, var] treats all variables other than var as constants.

Appearance is an option for displayed objects such as Button and Slider that specifies the general type of appearance they should have.

AppellF1[a, b_1, b_2, c, x, y] is the Appell hypergeometric function of two variables F_1 (a; b_1, b_2; c; x, y).

Apply[f, expr] or f @@ expr replaces the head of expr by f. Apply[f, expr, {1}] or f @@@ expr replaces heads at level 1 of expr by f.Apply[f, expr, levelspec] replaces heads ...

ArcCosh[z] gives the inverse hyperbolic cosine cosh -1 (z) of the complex number z.

ArcSinDistribution[{x min, x max}] represents the arc sine distribution supported between x min and x max.