# isInverseMap(RationalMap,RationalMap) -- checks whether two rational maps are one the inverse of the other

## Synopsis

• Function: isInverseMap
• Usage:
isInverseMap(phi,psi)
• Inputs:
• phi,
• psi,
• Outputs:
• , whether phi * psi == 1 and psi * phi == 1
• Consequences:
• If the answer is affirmative, then the system will be informed and so commands like 'inverse phi' will execute fast.