The result is expressed by means of a spectral sequence and associated standard notation.

He says that if he is right, any star in the main spectral sequence will have planets.

Even when this does not happen, it is often possible to get useful information from a spectral sequence by various tricks.

In fact, all known spectral sequences can be constructed using exact couples.

To pass to the next sheet of the spectral sequence, we will form the derived couple.

C corresponds to the E term of the spectral sequence.

To get a spectral sequence, we will reduce to the previous example.

What remains is to find a relationship between these two spectral sequences.

Despite this, it is still possible to gain useful information from these two spectral sequences.

A powerful tool for doing this is provided by spectral sequences.