The special value, nil, is a zero-length list. It is the only logically false value in Gamma. All other Gamma values are considered to be logically true. A common mistake for first-time Gamma programmers is to treat the number zero as logically false.
Gamma> x = 5; 5 Gamma> x > 10; nil Gamma> int_p(x); t Gamma> real_p(x); nil Gamma> !3; nil Gamma> !t; nil Gamma>
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