#
My Erdős Number

### What is an Erdős Number?

It is the number of "hops" needed
to connect the author of a paper with the prolific late mathematician
Paul Erdős. An author's Erdős number is 1 if they have coauthored a
paper with Erdős, it is 2 if they have not coauthored with
Erdős, but they have coauthored a paper with someone who has
coauthored a paper with Erdős, etc. To learn more about
Erdős numbers, check out the Erdős Number Project.

#### My Erdős number is currently 4:

- Paul Muhly and Mark Tomforde,
*Adding tails to
C*-correspondences*, Documenta Math. **9** (2004), 79--106.

- R.G. Douglas, P. S. Muhly, and Carl Pearcy,
*Lifting commuting
operators*, Michigan Math. J. **15** (1968) 385--395.

- R. G. Douglas, H. S. Shapiro, and A.L. Shields,
*Cyclic vectors and
invariant subspaces for the backward shift operator*, Ann. Inst.
Fourier **20** (1970), 37--76.

- P. Erdős, H. S. Shapiro, and A. L. Shields,
*Large and small
subspaces of Hilbert space*, Michigan Math. J. **12** (1965),
169--178.

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