NHoldFirst is an attribute which specifies that the first argument to a function should not be affected by N.
NumberFieldDiscriminant[a] gives the discriminant of the field \[DoubleStruckCapitalQ][a] generated by the algebraic number a.
NumberFieldFundamentalUnits[a] gives a list of fundamental units for the field \[DoubleStruckCapitalQ][a] generated by the algebraic number a.
NumberFieldIntegralBasis[a] gives an integral basis for the field \[DoubleStruckCapitalQ][a] generated by the algebraic number a.
NumberFieldRegulator[a] gives the regulator of the field \[DoubleStruckCapitalQ][a] generated by the algebraic number a.
NumberFieldSignature[a] gives the signature of the field \[DoubleStruckCapitalQ][a] generated by the algebraic number a.
OutputControllabilityMatrix[ss] gives the output controllability matrix of the StateSpaceModel object ss.
PartitionsQ[n] gives the number q (n) of partitions of the integer n into distinct parts.
PathGraphQ[g] yields True if the graph g is a path and False otherwise.
PermutationListQ[expr] returns True if expr is a valid permutation list and False otherwise.