Prove or disprove: (a)∃ sets A,B ∀ functions f: A→B, f is a bijection. (b) if f : A → B is a function, C ⊆ A, and D ⊆ B, then f : C → D is always a function. [Note 1: one is true, the other is false.] [Note 2: feel free to draw bubble-arrow pictures here, but make sure you explain what’s going on very carefully.]

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.