Ptolemy once asked Euclid whether there was any shorter way to a knowledge of geometry than by a study of the Elements, whereupon Euclid answered that there was no royal road to geometry. iii Proclus ...
Introduction An algebra or relational system usually is called rigid if its automorphism group or endomorphism monoid is trivial, i.e. consists of the indentity only. Sometimes constants are also cons...
Introduction An algebra or relational system usually is called rigid if its automorphism group or endomorphism monoid is trivial, i.e. consists of the indentity only. Sometimes constants are also cons...