| Main Sequence, Mu-Ency at MROB |

| | The **Main** **Sequence** is the set of secondary continental mu-atoms with internal angle 1/N for integer N>2, and R2 names R2.1/Na; the first few are R2.1/2a, R2.1/3a, R2.1/4a, etc. See also the entries for R2 and R2C(0). |

| | The orbital dynamics of the **main** **sequence** mu-atom R2.1/Na is the simplest of all period-N mu-atoms. |

| | The **main** **sequence** mu-atoms decrease in size in a manner that is proportional to the cube of the period: the main-sequence mu-atom of period 2N will be 1/8 the size of the main-sequence mu-atom of period N. |

| www.mrob.com /pub/muency/mainsequence.html (181 words) |