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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.
I'm having a hard time finding an example of usage. This is similar: http://en.wikipedia.org/wiki/Subset#The_symbols_.E2.8A.82_and_.E2.8A.83 I may have generalized it to any order, though. Anyway, I don't care if you want my advice or not. Thank you, have a good day.
I know a maths professor who does that. I agree that he is in the minority, but they do exist.
Can you write "strictly less than" instead of "less than"? Some use "less than" to mean "less than or equal". So to be safe one should always say "less than or equal" and "strictly less than".
Not very efficient, but very cute!