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Is there a test for a (finite) group in order to know if it is indecomposable? if so is this test equivelent to the definition of the indecomposable group

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    Cross post from MO: http://mathoverflow.net/questions/82034/is-there-a-test-for-finite-indecomposable-groups2011-11-30
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    yes,it's also my post .what's the problem?2011-11-30
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    @user20216: It is considered bad manners to post in both fora without alerting users that the question has also been asked elsewhere. By alerting users that the question was also posted in mathoverflow, you inform users here so they can go check the post there and make sure they are not duplicating the effort of others (i.e., wasting their time). Symmetrically, you should inform people *there* that the post was made here for the very same reason.2011-11-30

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