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Arithmomania (from Greek arithmós, "number", and maníā, "compulsion") is a mental disorder that may be seen as an expression of obsessive–compulsive disorder (OCD). [1] Individuals experiencing this disorder have a strong need to count their actions or objects in their surroundings.
A typical distribution of letters in English language text. Weak ciphers do not sufficiently mask the distribution, and this might be exploited by a cryptanalyst to read the message. In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext.
The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...
The only diagnosis existing in DSM-5 is obsessive–compulsive disorder. [2] According to DSM-5 compulsions can be mental, but they are always repetitive actions like "praying, counting, repeating words silently". [26] DSM-5 does not have any information that searching an answer for some question can be associated with OCD. [27]
Combinatorics on words is a fairly new field of mathematics, branching from combinatorics, which focuses on the study of words and formal languages. The subject looks at letters or symbols, and the sequences they form. Combinatorics on words affects various areas of mathematical study, including algebra and computer science. There have been a ...
OCD Obsessive-compulsive disorder: ODD Oppositional defiant disorder: OHF Omsk hemorrhagic fever: OMA Oculomotor apraxia: ON Osteonecrosis: OPC Oropharyngeal candidiasis: OPCA Olivopontocerebellar atrophy: OSA Obstructive sleep apnea: OSDD Other Specified Dissociative Disorder
It disregards word order (and thus most of syntax or grammar) but captures multiplicity. The bag-of-words model is commonly used in methods of document classification where, for example, the (frequency of) occurrence of each word is used as a feature for training a classifier. [1] It has also been used for computer vision. [2]
Racing thoughts refers to the rapid thought patterns that often occur in manic, hypomanic, or mixed episodes.While racing thoughts are most commonly described in people with bipolar disorder and sleep apnea, they are also common with anxiety disorders, obsessive–compulsive disorder (OCD), and other psychiatric disorders such as attention deficit hyperactivity disorder (ADHD).