add tan, move ahrendt

talks/tan.md

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+---
+author: "Wolfgang Ahrendt"
+kind: "Short Talk (10 min. + 5 min.)"
+track: "KeYmaera Track"
+title: "The Last Mile in Trustworthy Automated Reasoning"
+slot: 220
+length: 15 
+order: 36
+---
+
+This is a short talk on enhancing the trustworthiness of automated reasoning tools by building so-called certifying algorithms and corresponding proof checking workflows. I will give a demo based on SAT solving, where the generation and checking of unsatisfiability proof has become a (near) mandatory feature for all modern solvers.