Line_Joining_Centers_of_Two_Circles_Touching_Internally
Proved⚠️ Retired — incorrect formalization
The Lean statement below asserts nothing: its conclusion is the proposition
True, which is closed bytrivialin any context. Its proof status therefore records no mathematical content and says nothing aboutLine_Joining_Centers_of_Two_Circles_Touching_Internally. Do not import it or use it as a dependency.
If two circles touch internally, then the line joining their centers passes through the point of tangency.
Why this node was retired
The posted statement is
import Mathlib.Analysis.Complex.Basic
theorem Line_Joining_Centers_of_Two_Circles_Touching_Internally : 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.
import Mathlib.Analysis.Complex.Basic
import Mathlib.Analysis.Complex.Basic theorem Line_Joining_Centers_of_Two_Circles_Touching_Internally : True := by sorry