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Why do people think downvotes need explanation?
12 votes

I will concentrate on the question why MSE may be somewhat different in this respect and refrain from the discussion about the value of down-votes with or without explanation. This applies at least ...

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Are the tags "projective-spaces" and "projective-geometry" synonyms?
7 votes

The projective-space tag is---according to the description---about the space of lines through the origin in some vector space in geometry, so every geometric question that relates to $\mathbb{C}P^n$ ...

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