Prove that the following sets are open: 1) The left half plane { z: Re z < 0} 2) The open disk D(z,r) for any z in the Complex set C and r > 0 Can someone give me hints how to do these questions? I have no idea Thanks
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Originally Posted by knguyen2005 Prove that the following sets are open: 1) The left half plane { z: Re z < 0} 2) The open disk D(z,r) for any z in the Complex set C and r > 0 Can someone give me hints how to do these questions? I have no idea Thanks What is the definition of open? It means for any in the set there is such that is contained in the set. Use that definition.
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