A common Natural Language Processing (NLP) task is to determine semantic similarity between two sentences. Has the question of agreement/disagreement between two sentences been covered in NLP or other literature? I tried searching on Google Scholar but didn't get any relevant results.
I would propose to do some researching in the field of Stance Classification. Given a target claim or argument we can classify whether a number of sentences are in favor, against or neither of that claim. So an idea is to extract the topic of those sentences classify whether they agree or disagree with it and depending that classification you can determine if those sentence agree or disagree.
Here are some papers you can look at: