Finding elements that match a pattern. This gives the elements of the list which match the pattern x^_. Here is the total number of elements which match the pattern.

In many practical situations it is convenient to consider limits in which a fixed amount of something is concentrated into an infinitesimal region. Ordinary mathematical ...

Thread[f[args]] "threads" f over any lists that appear in args. Thread[f[args], h] threads f over any objects with head h that appear in args. Thread[f[args], h, n] threads f ...

RandomGraph[n, p] constructs a random labeled graph on n vertices with an edge probability of p.

Break[] exits the nearest enclosing Do, For, or While.

ComplexityFunction is an option for Simplify and other functions which gives a function to rank the complexity of different forms of an expression.

NextPrime[n] gives the next prime above n.NextPrime[n, k] gives the k\[Null]^th prime above n.

RankedMin[list, n] gives the n\[Null]^th smallest element in list.

RemoveScheduledTask[obj] remove the obj from the list of currently set tasks.

RiemannR[x] gives the Riemann prime counting function R(x).