Unsatisfiability

These errors embody the idea that "something should have been true, but it is not." There are three cases in which this may arise.

See arrow.meta.plugins.analysis.phases.analysis.solver.checkImplicationOf for the code which produces the errors.

The one constraint name and Boolean formula which could not be satisfied.
A counter-example (also called a model), which is an assignment of values to variableswhich show a specific instance in which the constraint is false.
In the f function above in the UnsatBodyPost epigraph, one such counter-example is x == 0, since in that case 0 + 0 > 1 is false.
By looking at the values of the model for the arguments, we can derive one specific trace for which the function fails.