<div dir="auto">Regardless of its use, the concept is equally simple. The definition of "=" is the only difference.<br><br>Frank<br><div data-smartmail="gmail_signature">---<br>Frank C. Wimberly<br>140 Calle Ojo Feliz, <br>Santa Fe, NM 87505<br><br>505 670-9918<br>Santa Fe, NM</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 13, 2020, 12:23 PM Jon Zingale <<a href="mailto:jonzingale@gmail.com">jonzingale@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Tom,<br>
<br>
Perhaps one of the most common usages of the Kronecker delta,<br>
and a usage we skirted in the discussion, is to establish biorthogonality<br>
between a vector space and its dual space. The Kronecker delta arises<br>
when given an indexed basis and its indexed dual set (which may or<br>
may not span the dual space), we take inner products of vectors in<br>
the first with vectors in the second. Because of linear independence<br>
in both sets, the inner product will take the value 1 when the vectors<br>
correspond and 0 otherwise. The Kronecker delta, in this case, is a<br>
manifestation of inner products and duality.<br>
<br>
Jon<br>
<br>
<br>
<br>
--<br>
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