Each of the arrow diagrams below define a function f. For each arrow diagram, indicate whether f−1 is well-defined. If f−1 is not well-defined, indicate why. If f−1 is well-defined, give an arrow...

Each of the arrow diagrams below define a function f. For each arrow diagram, indicate whether f−1 is well-defined. If f−1 is not well-defined, indicate why. If f−1 is well-defined, give an arrow diagram showing f−1.