Janko group
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In mathematics, the Janko groups J1, J2, J3 and J4 are the four of the twenty-six sporadic groups discovered by Zvonimir Janko. Unlike the Fischer groups, Conway groups, and Mathieu groups, the Janko groups do not form a series and have little in common (though the second and third were discovered at the same time as they happen to share an involution centralizer).
For more about each group see the following articles: