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One sends blood samples to the pathology lab. where it may be tested for pathogen by a pathologist. So the use is analogical with medical use. My dear old Dad (a doctor) would sometimes talk about a disease's pathology, meaning what "its" effect is. A pathological input would be an input which acts like a pathogen in an otherwise good system and produces an unwanted/unplanned/undesirable effect. (To remember the spelling I always have to remember the pronunciation of pathOlogy.) This is, of course, why theoretical studies such as Kawaguchi-san's are so useful: theory can help us know the characteristics of algorithms and systems and so anticipate many pathological cases. Cheers, Rick Jelliffe
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