CheckBirational  whether to check birationality
Synopsis

 Usage:
CheckBirational=>b
Description
If true, inverseOfMap, isEmbedding and sourceInversionFactor will check whether the passed map is birational. If it is not birational, it will throw an error.
See also

inverseOfMap  inverse of a birational map between projective varieties

isEmbedding  whether a rational map of projective varieties is a closed embedding

sourceInversionFactor  computes the common factor among the components of the composition of the inverse map and the original map
Functions with optional argument named CheckBirational :

"inverseOfMap(...,CheckBirational=>...)"  see inverseOfMap  inverse of a birational map between projective varieties

"sourceInversionFactor(...,CheckBirational=>...)"  see sourceInversionFactor  computes the common factor among the components of the composition of the inverse map and the original map