[seqfan] Re: Number of Euler graphs: A002854 or something else?

N. J. A. Sloane njas at research.att.com
Fri Feb 5 02:15:55 CET 2010

Brendan said:

> And OEIS should state the definition being used for A002854.

It does!  Look:

%C A002854 A graph is an Euler graph iff every node has even degree. It need not be connected. 

This definition is the one used in most of the references given in A002854, I believe.  

Certainly Jaap Seidel always used it.

And it is the definition used by one of the great classic books,
Seshu and Reed, Linear Graphs and Electrical Networks,
McGraw-Hill 1961, a book I studied in great detail when it came out!

Of course definitions can change over time, and in any case
one should not argue about them too much.


More information about the SeqFan mailing list