VerifyConvergence is an option to Sum, NSum, and similar functions that specifies whether convergence checking should be done.
VertexComponent[g, {v_1, v_2, ...}] gives the vertices in the graph g that have a path to at least one of v_1, v_2, ....VertexComponent[g, {v_1, v_2, ...}, k] gives the ...
$CompilationTarget gives the default value for the option CompilationTarget of Compile.
$DateStringFormat gives the default format to use for date strings generated by DateString.
$Language is a list of strings which give the names of languages to use for messages.
$Messages gives the list of files and pipes to which message output is sent.
$TimeUnit gives the minimum time interval in seconds recorded on your computer system.
Many programs you write will involve operations that need to be iterated several times. Nest and NestList are powerful constructs for doing this. Applying functions of one ...
Using Previous Results Defining Variables Values for Symbols
Manipulate Introduction to Control Objects Views