Types of divergence My teacher said there are two main ways a sequence can diverge, it can increase in magnitude without bound, or it can fail to resolve to any one limit.
But maybe that second kind of divergence is too diverse? There is a big difference between the divergent sequence 1, -1, 1, -1 . . . 
And the sequence formed by taking a digit from pi, g, then adding up the next g digits of pi and dividing that by g. (6/3, 25/5, 36/5, 11/2, 18/4, . . . )
Yet both of the above are more orderly than a sequence of random numbers. From what little I understand of randomness.
So maybe we should say that we have:


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*Sequences that increase in magnitude without bound.

*Sequences the can be decomposed in to convergent sub sequences, or in to sequences as in #1

*Sequences based on a rule.

*Random sequences.


Yet, a random sequence, with even distribution will have convergent sub sequences to every number in it's range...suddenly randomness seems orderly.
What do professionals say about types of divergence?

Every sequence that doesn't increase in magnitude without bound can be decomposed into convergent subsequences. 
EDIT: Maybe a useful way of classifying divergent sequences (of real numbers) would be by the set of accumulation points, that is, by the set of limit points of convergent subsequences. One could ask 


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*Is $+\infty$ an accumulation point? 

*Is $-\infty$ an accumulation point? 

*Are there any finite accumulation points? 

*Is there more than one finite accumulation point? 

*Are there infinitely many accumulation points? 

*Are there uncountably many accumulation points? 

*Is every real number an accumulation point? 
