ABSTRACT
We assume throughout this part that (X, C https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203743010/3cd48002-c996-481e-a9b0-0f35007cebae/content/eq1747.tif"/> ) is a given category base and I https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203743010/3cd48002-c996-481e-a9b0-0f35007cebae/content/eq1748.tif"/> is a given ideal of subsets of X.
