Umbral moonshine

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In mathematics, umbral moonshine is the name for a mysterious connection between the Mathieu group M24 and K3 surfaces, observed by Tohru Eguchi, Hirosi Ooguri, and Yuji Tachikawa (2011). Cheng, Duncan & Harvey (2012) observed that some of the functions appearing in umbral moonshine are Ramanujan's Mock theta functions.