Anonymous217
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That's being too vague on your definition. As I said, it depends moreover on how you define your set which contains 0. Any approach to zero in the complex plane approaches 0 = a + bi = 0 + 0i, which is 0 in the real and 0 in the complex. Or you could consider C as R^2, so 0 in C is just (0,0) in R^2. In R^2, (0,0) is "purely real". However in C, 0 is "both imaginary and real". So even if you're considering two isomorphic structures, what the element actually means depends on what the structure is.agentredlum said:If you approach zero on the real axis then it's puely real, although it's negative on the left and positive on the right.
If you approach zero on the imaginary axis, then it's purely imaginary, negative on the bottom and positive on top.
These are not the only ways to approach zero in the complex plane. If you approach zero in any other way then it is neither purely real, nor purely imaginary. You also lose the notion of positive or negative.
So, can we say that in the complex plane zero is both and neither but depends on how you approach zero?
This is your equivalent question: "What does the identity element represent in set-theoretic terms for any set containing it?" However, this can't be answered because first of all, it's not even possible to generalize what the identity element represents, since what it represents depends on the set you're discussing. In one set, the identity could be "purely real" and in another, the identity could be "purely bananas".