A.6.3.RT.OE:4.2 - Give recurring parts a stable interpretation

Identify which elements must remain recognizable across the expression. Use the selected scheme’s names, positions, types, units, binding rules or temporal references to keep them connected.

When one part belongs to different groupings, retain its identity through the change of grouping. A line can be examined as a circle’s radius and then as a triangle’s side. A quantity can appear in two equations whose combination depends on it denoting the same value under the same conditions.

When similar marks denote different parts, distinguish them before combining their relations. For a formula with a bound variable and a free variable, preserve the binding scopes when renaming. For a repeated rhythmic sign, its position can distinguish occurrences even when the syllable is unchanged.

Use the amount of labeling the operation needs. Reuse familiar conventions; explain a local convention at its first consequential use.