205954
The abutment means integral cohomology of the total space X. This spectral sequence can be derived from an exact couple built out of the long exact sequences of the cohomology of the pair ( Xp , Xp − 1 ) , where Xp is the restriction of the fibration over the p-skeleton of B. More precisely , using this notation , f is defined by restricting each piece on Xp to Xp − 1 , g is defined using the coboundary map in the long exact sequence of the pair , and h is defined by restricting ( Xp , Xp − 1 ) to Xp .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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