Cem Say

<p>Ahmet Celal Cem Say (born 14 March 1966 in <a href="/facts/Ankara/llGIJ0vj">Ankara</a>) is a <a href="/facts/Turkish_people/3Rg0k6vU">Turkish</a> <a href="/facts/Theoretical_computer_scientist/jSkGGuvy">theoretical computer scientist</a> and professor of computer science. He is a full time professor at the <a href="/facts/Bo%25C4%259Fazi%25C3%25A7i_University/Se5yHul2">Boğaziçi University</a> Department of <a href="/facts/Computer_Engineering/5x1TRKGo">Computer Engineering</a> in <a href="/facts/Istanbul/Xo1hzGWH">Istanbul</a>, <a href="/facts/Turkey/KIYAWAs0">Turkey</a>. Cem Say is the author of the QSI algorithm for qualitative system identification, an AI task relevant in the study of <a href="/facts/Qualitative_reasoning/LlI6wJp7">qualitative reasoning</a>. His work in complexity theory includes studies on small-space quantum <a href="/facts/Finite-state_machine/GMusWd0a">finite-state machines</a> and new characterizations of the complexity classes <a href="/facts/NL_(complexity)/FvNaeSaM">NL</a> and <a href="/facts/P_(complexity)/2TYvck4k">P</a> in terms of verifiers modeled by finite-state machines allowed to use only a fixed number of random bits. He is also known for his advocacy of people wrongly accused with forged digital evidence, and his popular science books.  
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Cem Say