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Re:Dijkstra: Reasoning About Programs (1990) [video] by zengid on Sunday May 20, 2018 @11:01AM (#17112988)
I'm always excited when I realize that my one semester of Discrete Math allows me to understand lectures like this!
Re:Dijkstra: Reasoning About Programs (1990) [video] by jonsen on Sunday May 20, 2018 @03:39PM (#17114400)
If you are tempted to dig further into these techniques there's this book:

https://www.amazon.com/Science-Programming-Monographs-Comput...