cognitive psychology. PhD 
This is a beautiful dichotomy by @wcrichton to think about problems. I like to think of subtractive solutions as a (cartesian) product space that is pruned away and additive ones as a quotient space where abstractions build equivalence classes:https://twitter.com/wcrichton/status/1338611091119747073 …
Can you elaborate on abstractions as equivalence classes in a quotient space? Not familiar with quotient spaces so the analogy is hard to grasp.
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I am not too deep on how quotient spaces work, but here is what I have learnt so far. They are the idea by which you create an equivalence classes by dividing or partitioning a space you study. I have come to see it is a core idea behind building abstractions and understanding.
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Whenever we work with algorithms on a domain, we create abstractions which establish equivalence classes that partitions a space by various “aspects”. The aspects we choose lets us classify a phenomena into different classes depending on the nature of the elements in the domain.pic.twitter.com/KJpMxEwuRI
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