2 thoughts on “Drawing I, Cross Contour Problem:

  1. I am currently writing a textbook for my students. I would like to request for your permission to use three of these cross-contour images in my book. Copyright acknowledgement will be given to you as (c) Robert Pollien. Is that alright with you?

  2. Prof. Yong-
    The copyright for these drawings is retained by the students not myself. I cannot give permission to use them for publication and regrettably do not have contact information for the students.
    R. Pollien

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