| Petersen biography (1540 words) |
 | Julius Petersen's father was Jens Petersen, who worked as a dyer, and his mother was Anna Cathrina Petersen who was born in Wiuff. |
| Petersen never returned to cryptography; this seems to be another instance of a problem that must have occupied him intensely for a period, until he found a satisfactory solution and moved on to something else. |
| Petersen was also a founder member of the Danish Mathematical Society, which came into existence in 1873, and he remained a very active member of the Society. |
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