<div dir="ltr"><div><div><div><div>|It has been shown that the extension of LS6 -> LS8 has no PB
lead-ends at least as far as 60!<br><br></div>I've no doubt it's possible to write program to check considerably higher than 60 but that's not the same as a proof that holds for every one of the infinitely many cases ofcourse.<br></div>Somewhat hypothetical ofcourse (who is going to ring London on >60 ) but is there not now a rule stating than an extension must go work on an infinite number of stages. If London S Major were named today would it be allowed to be called London? And if not how would could it be proven that the extension doesn't go on an infinite number of stages?<br><br></div>Cheers,<br></div>Alan<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 22 March 2017 at 10:33, Robin Woolley <span dir="ltr"><<a href="mailto:robin@robinw.org.uk" target="_blank">robin@robinw.org.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Quick reply to Alan.<br>
<br>
It has been shown that the extension of LS6 -> LS8 has no PB
lead-ends at least as far as 60! There are four extensions in toto
from 6->8 with PB lead ends all with this 'quality' - if that's
the right word.<br>
<br>
<p class="MsoNormal"><span>5-5.6.5.2.5.36.4-4.3.6-6.5,2<u></u><u></u></span></p>
<p class="MsoNormal"><span>5-5.4.5.2.5.36.4-4.5.6-6.5,2<u></u><u></u></span></p>
<p class="MsoNormal"><span>3-3.4-2-3.4-4.5.6-6.5,2<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:4.0pt"><span>3-3.4-2-36.4-4.3.6-6.3,2
(8)<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></p><span class="HOEnZb"><font color="#888888">
R.<br>
</font></span></div>
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