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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You can google "reducing to common denominator".
and define D and N_x for x from 1 to n
I have a vague idea from my math classes but the way the problem is exposed makes almost no sense to me, si D supposed to be the common denominator of what ?