In the 'symbolic' stage of mathematical notation, comprehensive notational systems for formulas became the norm.
Notes on verification
Well-corroborated by multiple independent sources including Wikipedia articles, a peer-reviewed source, and historical summaries, all consistent with Cajori's classic taxonomy of mathematical notation stages. [tier=silver indep_score=0.925 clusters=2 claim_tier=everyday]
Sources
- Timeline of mathematics (wikipedia)
- https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1949-8594.2000.tb17262.x (corroboration)
- https://www.cut-the-knot.org/language/symb.shtml (corroboration)