What is the meaning of "formal" in math-speak? – math.stackexchange.com

What is the meaning of "formal" in math-speak? – math.stackexchange.com

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I have been encountering the word "formal" in several math books, and I don't understand what it means in context. For example, Hatcher describes n-chains as "finite formal sums" on p. 105 and p. ...

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