Please see attached image for problem statement (it is letter "e").

So far, I know that to compute the Matrix Representation of T in the ordered Bases B and Y you do the following:

1. Compute T(xi) where xi denotes the standard basis vectors for V.

2. Write the vectors downwards in columns in the matrix.

However, for letter e, I'm not sure what the standard basis vectors are. I googled, and found out that a common representation might be {e1,e2,...,en}, and using this I got the answer to be a 2 by infinity matrix with {e1,e2,...,en} as both column vectors.

Can somebody clarify this for me? Thank you!