In mathematics, we have series, like
1, 2, 3, 4, 5, ...
Should I say 'the series is convergent' or 'the series are convergent'?
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You might want to check this: ell.stackexchange.com/questions/23268/… – shin Jul 14 '16 at 3:01
The word 'series' is both a singular and plural form. When it has the singular sense of 'one set', it takes a singular verb. When it has the plural sense of two or more sets, it takes a plural verb. For examples:
A series of lectures is scheduled.
Two series of lectures are scheduled: one for experts and one for laypeople. (The Free Dictionary).
1,2,3,4,5,....
Here we are talking about a set of numbers, so the right sentence is:
The series is convergent.
1,2,3,4,5....
One series: The series is _____
2,4,6,8,10...
1,4,9,16,25....
Two or more series: The series are _____
