Question: Could someone please help me with this question Definition: Ler S be a subset of RR. A point X in OR is an interior point

Could someone please help me with this question

Definition: Ler S be a subset of RR. A point X in OR is an interior point of S if There exists a neighborhood N of x Such That NSS. Ler S and T be subsets of RR. Prove: inc (S) is an open set using The definition above
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