comparative adj.

[daisy1352]

Isn't this tree bigger than the others? We use comparative adjectives to compare two things why do we here use the others?

[Tdol]

The two things you compare can be singular or plural:
This house is cheaper than that one.
These houses are cheaper than those.
These houses are cheaper than that one.
This house is cheaper than those.

[JCrawf]

Isn't this tree bigger than the others? We use comparative adjectives to compare two things why do we here use the others?

If the words in brackets are understood, only two things are being compared:
Isn't this tree bigger than [any one of] the others?

Regards