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## Main Question or Discussion Point

Working on some problems that have vectors, for example

f(x) = [-x

And then I am asked to find the largest interval of existence. The answer says "E = R

I'm not sure what this means. Does it mean the interval of existence is everywhere except 0? Is that what the ~ {0} means? It seems like the answer is that any x1, x2 value in R2 space satisfies continuity, but then I have no idea where the ~{0} comes from.

f(x) = [-x

_{1}/|X|^{3}, -x_{2}/|X|^{3}]And then I am asked to find the largest interval of existence. The answer says "E = R

^{2}~ {0}.I'm not sure what this means. Does it mean the interval of existence is everywhere except 0? Is that what the ~ {0} means? It seems like the answer is that any x1, x2 value in R2 space satisfies continuity, but then I have no idea where the ~{0} comes from.

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