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How can I represent the semantic content of a sentence or a word in a formal way? So far, I only know that you can use sets of features, but what are the alternative theories?

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    This question is too broad. "How can I represent meaning in a formal way" is what entire books deal with. You should make your question more specific in order to make it answerable within a few paragraphs. – lemontree Jan 30 '17 at 23:34
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    For recommendations on introductory semantics textbooks, see here – lemontree Jan 30 '17 at 23:36
  • Think about logic. It's designed for representing propositions (statements that can be true or false under some circumstances), and it can be extended to represent syntactic structure, as well. – jlawler Jan 31 '17 at 1:25
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    As I understand, semantics is not directly related to topic extraction. I mean, semantic content of a sentence can be researched in terms of an emotional value, or of word sense disambiguation, or something else, but I want to research exactly extraction of the topic of a message. What can I read about it? I've read some russian books about general semantics, but found nothing about that. – Amir Jan 31 '17 at 7:28
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    If you want to extract the topic of the message, you need a very strict all-encompassing machine-washable definition of "topic of the message" to train with. Topic is not a very exact term in current use, and ranges anywhere from one-word to sentence to paragraph level. Indeed, it may use words that don't appear in the message it's "extracted" from. – jlawler Jan 31 '17 at 17:09

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