# arrow

An arrow is a line, usually straight, capped at one end, or both ends, with an arrowhead which points in a specific direction. In a flowchart, arrows show the order in which instructions are to be performed (including where branching may occur) or they show the flow of cause and effect. In certain arrangements of numbers, such as the Collatz tree, arrows show which numbers are the input values, with the output value being pointed at by the arrowhead.

In writing about vectors, arrows can be written over the symbols for the origin and the endpoint, e.g., $\overrightarrow{AB}$ and $\overleftarrow{CD}$. TeX provides commands for these.

An arrow, regarded as a morphism, functor or natural transformation also plays central roles in Category Theory and Categorical Dynamics.

 Title arrow Canonical name Arrow Date of creation 2013-03-22 12:55:46 Last modified on 2013-03-22 12:55:46 Owner PrimeFan (13766) Last modified by PrimeFan (13766) Numerical id 14 Author PrimeFan (13766) Entry type Definition Classification msc 00A99 Related topic Morphism Related topic Functor Related topic NaturalTransformation Related topic Mapping Related topic Vector Related topic Category