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The opposite of "real" depends on its usage. It may be:unreal, imaginary, nonexistent, illusory, immaterial, intangiblefake, false, imitation, counterfeituntrue, dubious, invalid, questionable
Yes. The number 1 + i is imaginary but not pure imaginary, while 5i is pure imaginary.
An invalid argument is when the facts you are using are invalid or your forms of defense are wrong or incorrect, a valid argument is the opposite of an invalid argument. "There is a windmill in my beard. your argument is invalid." (This is a good example of a bad contradiction)
No difference. The set of complex numbers includes the set of imaginary numbers.
It is a pure imaginary number.Since (a+bi)-(a-bi) = 2bi, it is a pure imaginary number (it has no real component).