Janko group J2
| Algebraic structure → Group theory Group theory | 
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In the area of modern algebra known as group theory, the Janko group J2 or the Hall-Janko group HJ is a sporadic simple group of order
- 604,800 = 27 · 33 · 52 · 7
- ≈ 6×105.
| Algebraic structure → Group theory Group theory | 
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| Basic notions | 
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 Infinite dimensional Lie group  
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In the area of modern algebra known as group theory, the Janko group J2 or the Hall-Janko group HJ is a sporadic simple group of order