4. Show that if A is closed in Y and Y is closed in X, then A is closed in X. Verify it and make some illustrations.

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Q: 21) which of the following sequences is converge or diverge: {²√n} 8.6 } "

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Q: a. 2 uxx = Иxy - 4uy azu J2u azu ди b. + +4 +3+u = 0 ?х у дуг ?х ?x2 ди c. k = 2 ,k < 0 ду 02u ?хг

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