udunits/src/main/java/ucar/units/Factor.java
public boolean isReciprocalOf(final Factor that) {
		return getBase().equals(that.getBase())
				&& getExponent() == -that.getExponent();
	}
public boolean isReciprocalOf(final Factor that) {
		return getBase().equals(that.getBase())
				&& getExponent() == -that.getExponent();
	}
Indicates if this Factor is the reciprocal of another Factor.

@param that
The other factor.
@return <code>true</code> if and only if this Factor is the reciprocal of
<code>that</code>.