MATH.13:6 - Bias-Annotation
Visual sameness can distract from a cost, label meaning or boundary datum that distinguishes the cases. Transform those inputs explicitly.
A solver familiar with unique linear problems may carry uniqueness into a problem with several solutions. Keep the solution-set result available until uniqueness has its own basis.
A conserved-looking scalar can also invite the wrong inference from equivariance. Distinguish a quantity unchanged under a spatial transformation from a quantity unchanged as the system evolves. The oscillator computation exposes the practical difference.