This is one of two uni-directional bondgraphic connectors used in the definitions of the two causal bonds.

The bondgraphic connectors reference three variables, two of which are physical variables, whereas the third one is a topological variable. All three are defined as potential variables.

Potential variables:

 e:  Bondgraphic effort variable (input)

 f:  Bondgraphic flow variable (output)

 d:  Directional variable indicating the direction of positive power flow (output)

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