Adolin113355is/eius
ei / eum / eo
1yr ago#2817546
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We use "-" to denote two separate ideas. First, "-a" simply means the inverse of "a" in whatever group you're working with. Second, "a - b" is just shorthand for "a + (-b)". Thus, "4-(-4)" is equivalent to "4 + -(-4)" and "-(-4)" is simply 4 by the the uniqueness of additive inverses. Thus, "4-(-4) = 4+4 = 8".
It's best to pretend subtraction doesn't exist. Treat it as addition by the inverse instead.
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We use "-" to denote two separate ideas. First, "-a" simply means the inverse of "a" in whatever group you're working with. Second, "a - b" is just shorthand for "a + (-b)". Thus, "4-(-4)" is equivalent to "4 + -(-4)" and "-(-4)" is simply 4 by the the uniqueness of additive inverses. Thus, "4-(-4) = 4+4 = 8".
It's best to pretend subtraction doesn't exist. Treat it as addition by the inverse instead.
Jump in the discussion.
No email address required.
Subtraction and division are spooks.
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It's all just addition
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