votes up 1

A blockwise lower-triangular operator with non-singular operators on the main diagonal is always non-singular.

Package:
Exception Class:
ValueError

Raise code

        "blockwise structure.".format(
                    op.range_dimension, right_op.range_dimension))

  # pylint: disable=g-bool-id-comparison
  def _validate_non_singular(self, is_non_singular):
    if all(op.is_non_singular for op in self._diagonal_operators):
      if is_non_singular is False:
        raise ValueError(
            "A blockwise lower-triangular operator with non-singular operators "
            " on the main diagonal is always non-singular.")
      return True
    if any(op.is_non_singular is False for op in self._diagonal_operators):
      if is_non_singular is True:
        raise ValueError(
            "A blockwise lower-triangular operator with a singular operator on "
        
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