"compare"

[kelvin123]

Comparing a and b , a is....
Comparing a with b , a is....
compared with b, a is....

are they all correct grammatically?

[Abstract Idea]

Comparing a and b , a is....
Comparing a with b , a is....
compared with b, a is....

are they all correct grammatically?

It depends on the function domain, to which space belong a and b?
Oops -- I am kidding.

Well, I think all the three sentences are grammatically correct - but once more I would like to read a native speaker's point of view.

[bhaisahab]

It depends on the function domain, to which space belong a and b?
Oops -- I am kidding.

Well, I think all the three sentences are grammatically correct - but once more I would like to read a native speaker's point of view.

Yes, they are all correct grammatically.