Let X be a cofinite topological space. Then show that the derived set of A(denoted as A') is closed for any subset A of X. Solution: To ...

List all possible topologies on the set X={a,b}. Solution: When considering the set X = {a, b}, there are several possible topologies that c...

Let X ={a,b,c,d,e}   and let A={{a,b,d}, {d,c}, {c,e}, X} ba a subbase. Find the base B generated by A. Also, find the topology generated by...