starts with expr, then applies f repeatedly until the result no longer changes.
- FixedPoint[f, expr, n] stops after at most n steps.
- FixedPoint always returns the last result it gets.
- You can use Throw to exit from FixedPoint before it is finished.
- FixedPoint[f, expr] applies SameQ to successive pairs of results to determine whether a fixed point has been reached.
- FixedPoint[f, expr, ..., SameTest->s] applies s to successive pairs of results.
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