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Writing unit tests is pretty much standard practice these days. Otherwise, how would you make sure that your code does what you expect? Yet, some software is mission-critical and merely testing a few examples \u2013 or even randomized testing \u2013 is not enough. To reach higher levels of assurance, we need proof: mathematical, formal proof. This session will be based on an example from industry, where we successfully verified the core of a financial application. I will describe the core architecture of the system and the mathematical foundations behind the verification, including the classes of problems that we can (or cannot) discover with this approach.\nabout this event: https://bobkonf.de/2023/hupel.html