MultInvField for GAP 4

See

MultInvField-2018.11.03.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/MultInvField-2018.11.03.pdf or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/MultInvField-2018.11.03.pdf

See the following for further explanations:

BuildCarat.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/BuildCarat.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/BuildCarat.html

caratnumber.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/caratnumber.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/caratnumber.html

cohomology.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/cohomology.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/cohomology.html

crystcat.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/crystcat.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/crystcat.html

crystdat.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/crystdat.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/crystdat.html

FlabbyResolution.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/FlabbyResolution.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/FlabbyResolution.html

KS.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/KS.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/KS.html

res.pdf or
http://mathweb.sc.niigata-u.ac.jp/~hoshi/Algorithm/MultInvField/res.html or
https://www.math.kyoto-u.ac.jp/~yamasaki/Algorithm/MultInvField/res.html