If I is an independent set I, and e is an element such that $I \cup \{e\}$ is dependent (in particular e is not in I), then there is a unique circuit contained in $I \cup \{e\}$, called the fundamental circuit of e with respect to I, which moreover contains e. Every circuit is the fundamental circuit of some element with respect to some basis.
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This method does not perform any checks (e.g. whether $I$ is independent, or if $e$ is not in $I$). If $I \cup \{e\}$ is independent, then (if debugLevel is greater than 0) a warning is printed, and null is returned. In the example below, the elements with indices 2 and 3 are parallel (indeed, both are equal to the column vector (1, 1)). Thus in general it is safer to refer to a subset by its indices, rather than its elements.
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The object fundamentalCircuit is a method function.