|  |  E.2.1 Version schema for Singular 
SINGULAR version is of the form a.b.c.dwhich may also be written
asa-b-c-dwhere a,b,c and d are numbers: 
SINGULAR does also have "unofficial" build originating from
a code version between "official" version: such builds display
"Development version a.b.c" in the header while "official" versions
show "version a.b.c". Also the manual describes version a-b-c.
To get the complete version number, usea is changed with major, incompatible changes
b is changed with incompatible changes (of some commands/libraries)
c is changed with compatible changes (i.e. new commands,
      extended options, new algorithms, etc.)
d is changed with each release (i.e. with bug fixes, etc.)
 system("version");or useSINGULAR_VERSIONin C.
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