Let X = {a, b, c, d}. Determine which of the following collections of subsets of X
Chapter 16, Problem 16.13(choose chapter or problem)
Let X = {a, b, c, d}. Determine which of the following collections of subsets of X aretopologies on X. Verify your answers.(a) S1 = {, {a}, {a, b}, {a, c}}(b) S2 = {, X, {a, b}, {a, c}}(c) S3 = {, X, {a}, {a, b}, {a, d}, {a, b, d}}
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