<a href="https://www.youtube.com/watch?v=Ocr_zrec5C8&feature=youtu.be">Video</a> of the lecture<br>
<a href="https://www.youtube.com/watch?v=yuVqxCSsE7c">Waiting room video</a>: The Borsuk-Ulam Theorem and stolen necklaces<br><br>

Showed that the interval (-1,1) is homeomorphic to the real line <b>R</B> and that the real line <b>R</b> is not homeomorphic to the plane <b>R</b><sup>2</sup>.  For the latter we had to prove that connectedness is a topological property.