Well I guess this is not standard notation but here goes: Let be a set in , then is the boundry of A. and Now prove that and I just have no idea how to do this one. Any hints greatly appriciated.
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Originally Posted by hjortur Well I guess this is not standard notation but here goes: Let be a set in , then is the boundry of A. and Now prove that and I just have no idea how to do this one. Any hints greatly appriciated. I would just honestly try it. It isn't as ugly as it may appear. Let be in the LHS and deduce that it's in the RHS. Come back if you need help.
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