public static DoubleBinding exp(final ObservableDoubleValue a) {
        return createDoubleBinding(() -> Math.exp(a.get()), a);
    }
public static DoubleBinding exp ( final ObservableDoubleValue a ) { return createDoubleBinding ( ( ) -> Math . exp ( a . get ( ) ) , a ) ; }
Binding for {@link java.lang.Math#exp(double)}

@param   a   the exponent to raise <i>e</i> to.
@return  the value <i>e</i><sup>{@code a}</sup>,
where <i>e</i> is the base of the natural logarithms.