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Reactive Relational Algebra
databases plus wibbly wobbly timey wimey stuff
But hey, if you're rigorously thinking about databases/tables/spreadsheets, and you need to build on the work of really really smart people, then relational algebra starts looking like an attractive corner of math & computing theory. The whole reason I added the wibbly wobbly timey wimey stuff is that my spreadsheet program works with async data (e.g. HTTP requests, SQL queries). Intuitively, you can also guess that the behavior of all other operators are trivial exercises in some category theory theorem that bounced off the surface of my smooth brain.
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