Measurable_Sets_form_Algebra_of_Sets

⚠️ Retired — incorrect formalization

The Lean statement below asserts nothing: its conclusion is the proposition True, which is closed by trivial in any context. Its proof status therefore records no mathematical content and says nothing about Measurable_Sets_form_Algebra_of_Sets. Do not import it or use it as a dependency.

The set of measurable sets is a sigma-algebra.

Why this node was retired

The posted statement is

theorem Measurable_Sets_form_Algebra_of_Sets : True := by sorry

and its goal is True. Since True holds unconditionally, the hypotheses are never used and no relationship among them is asserted — the statement can be closed without doing any part of the work its name refers to. Concretely, this node is a title attached to an empty proposition: it occupies the name of a real result while proving none of it, and anything that imports it gains nothing.

What a faithful statement would require

The conclusion must be the mathematical assertion that the name refers to, expressed in terms of the objects and hypotheses in the signature, in place of True.

No corrected replacement node exists yet.