Prathyush

https://twitter.com/_julesh_/status/1321043594137001984 

https://arxiv.org/pdf/2009.14576.pdf

Used the symbol V to signify containment.

https://en.wikipedia.org/wiki/Topical_logic

https://grahamshawcross.com/2012/12/12/visual-thinking/

https://en.wikipedia.org/wiki/Marshall_Islands_stick_chart https://en.wikipedia.org/wiki/Quipu

An article that claims it to be a myth is available here: https://pdfs.semanticscholar.org/08f0/05a973ac17412b53cfa972e187819a740771.pdf

https://en.wikipedia.org/wiki/Egyptian_algebra#Aha_problems,_linear_equations_and_false_position

https://www.maa.org/press/periodicals/convergence/mathematical-treasures-johann-faulhabers-academia-algebrae