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The product of the transfer functions of all branches within a loop in a signal flow graph.

The product of the transfer functions of all branches in a path from one node to another in a signal flow graph.

A point in a signal flow graph that represents a variable or signal. Nodes are where signals either originate or combine.

A directed line segment connecting two nodes, indicating the path of the signal and its direction from one node to another with a transfer function.

A closed path in a signal flow graph in which the starting and ending node is the same, and no node is touched more than once.

A path through the signal flow graph that leads from an input to an output node without any node being encountered more than once.

A specific type of node where multiple incoming branches signals are algebraically summed together.

A node where the external input signal is injected into the signal flow graph. It only has outgoing branches.

A node that has both incoming and outgoing branches, representing intermediate variables in the signal flow graph.