returns a sublist of equations given a pivot
set of linear equations
variable chosen to carry out a pivot operation
The function pivoteqn(C, var) returns a sublist of equations from C. Each equation eq returned achieves the minimum non-negative ratio of
In the special case where all ratios are negative, the function returns FAIL.
The linear equations C are in the special form produced by simplex[setup].
The command with(simplex,pivoteqn) allows the use of the abbreviated form of this command.
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