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  Mathematical aliases
    <a href="choose.html">choose</a>     - Binomial coefficient: <a href="choose.html">CHOOSE</a>(N,K) =  N!K!/(N-K)!
    <a href="frac.html">frac</a>       - Fraction: <a href="frac.html">FRAC</a>(A,B)=A./B                                                    
    <a href="imlog.html">imlog</a>      - Imaginary part of log: <a href="imlog.html">IMLOG</a>(X)=UNWRAP(IMAG(LOG(X)))                                      
    <a href="iseven.html">iseven</a>     - True for even integer va