New class: exterior algebra
Add this new class, mimicking
- Target version changed from CoCoALib-0.99560 to CoCoALib-0.99570
JAA has made a first impl (mostly copying code from
RingWeyl). Many fns are still NYI.
Anna, Michele and Elisa are testing the code.
- Status changed from New to In Progress
- % Done changed from 0 to 20
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