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verification corner hello and welcome to another episode of verification corner i'm roosting leno when we write the program we we very often jump into the to the editor and start writing code right away today we're going to look at at modeling the code first so that we can get a good picture of that we're doing the right thing and the model can be refined into into the eventual code that is that's going to run on the computer here we go i'm bruce and leno i'm jean-ramon so ron ramon you've been you've invented a number of um formalisms for for developing programs and reasoning about programs uh the the z notation that is well uh well known in some circles and the um and the b method could you say something about where where has the b method being used well the b method has been used essentially um mainly in in train systems in particular um 10 years ago in the line 14 of the of the metroline in paris and more recently um there have been some other up abroad but more recently also the the shuttle at the charcoal airport right yep so for those viewers when you're in paris next time uh check out um the cdg shuttle and line 14 and you'll see where um where the software came from it's very impressive because there is no drivers right yes then you want it to be correct sure okay so after the b method you did um uh event b and that's what we're going to look at today could you say something about what motivated you to do event b instead of the b method uh the motivation is um to have the possibility to model um the an entire system not only the the software but with the complete system in the case of um we mentioned before the line 14 and the um and the shuttle uh the the system study was done uh by by professionals of course but but without using any formalism so if there has been there was there is not unfortunately an error there um this would not have been taken by the the further development so we want to we want to improve that the approach in uh doing some um some more work on the top of it right all right so we're going to look at event b today as implemented in the in the rodan tool and um and um please show me what you have yeah so so the idea is to present a small small example um the idea of a run b is is not directly to code but it's to observe a situation and the situation we're going to observe here is um the one in a bank um so we are going to define a little um we're going to define a little a little bank so the project is named um his name...