I. Symbols and Literals

Table of Contents
Data Types and Predicates -- testing for data types.
undefined_p, undefined_symbol_p --  test for undefined types and symbols.
Literals -- defined for integers, reals, strings, and symbols.
Predefined Symbols -- a table.
Reserved Words -- a table.
nil --  the logically false value.
gamma, phgamma -- start Gamma and Gamma/Photon from the shell prompt.
t --  a logically true value.

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