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# about notation watch

1. How do u write the proper mathematical notation for saying that x can be real and imaginary, x E (R and I)?

I am confused
2. C represents the field of complex numbers (I am assuming you do not require them to be real or imaginary but not complex).
3. (Original post by Mr M)
C represents the field of complex numbers (I am assuming you do not require them to be real or imaginary but not complex).
Thought he means just real or imaginary (so not for )...otherwise it's clearly just .
4. (Original post by wellison999)
Thought he means just real or imaginary (not complex)...otherwise it's clearly just .
Well I'm not convinced he did mean that but, if he did, your R union I will do fine!
5. yes i think R union I is good enough, thank you =)
but do u need to add a bracket around it? e.g. x E {R U I}? OR just as it is?
6. No bracket. That would mean x would have to BE the set R U I.

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