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Date: Mon, 5 Jan 2015 17:37:42 -0300
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Subject: Re: [lojban-beginners] perpendicular
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On Mon, Jan 5, 2015 at 4:16 AM, ravas <ravas@outlook.com> wrote:

>
> *sraji*
> *x1 is vertical/upright/erect/plumb/oriented straight up and down in
> reference frame/gravity x2.*
>
> What are the various things that work as a "reference frame"?
>

I don't know, but the default value would be the Earth. When x2 is a line
or a plane then "vertical" in its gravity field (assuming a uniform mass
density) would correspond to "perpendicular", so I think it's a reasonable
choice of word for "perpendicular".


xorxes: I wouldn't restrict it to lines. A line can be perpendicular to a
> plane, and also it should be usable with general objects.
>
> If you think sraji works,
> then I suggest that it could be used for general objects,
> and a different word could be used for lines and planes.
> The relationship of two lines or planes forming
> four equal angles seems unique.
>

I'm not sure what the advantage would be of having a separate word, but
brivla space is infinite, so it is possible to create words as nuanced as
one wants. If people will bother to learn and stick to such fine
distinctions is another issue. The same will happen with all geometric
words. Can a cookie be cukla, or do we need one word for circle and a
separate word for circular object? The gismu list is not very consistent
here (as usual). For example "bolci" has a place for its material, so
apparently it excludes the abstract sphere.

mu'o mi'e xorxes

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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Mon, Jan 5, 2015 at 4:16 AM, ravas <span dir=3D"ltr">&lt;<a href=3D"mail=
to:ravas@outlook.com" target=3D"_blank">ravas@outlook.com</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><br><span style=3D"=
font-family:verdana,sans-serif"><b>sraji</b><br><i>x1 is vertical/upright/e=
rect/plumb/oriented straight up and down in reference frame/gravity x2.</i>=
</span><br><br><span style=3D"font-family:courier new,monospace">What are t=
he various things that work as a &quot;reference frame&quot;?</span></div><=
/blockquote><div><br></div><div>I don&#39;t know, but the default value wou=
ld be the Earth. When x2 is a line or a plane then &quot;vertical&quot; in =
its gravity field (assuming a uniform mass density) would correspond to &qu=
ot;perpendicular&quot;, so I think it&#39;s a reasonable choice of word for=
 &quot;perpendicular&quot;.=C2=A0</div><div><br></div><div><br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><div dir=3D"ltr"><span style=3D"color:rgb(0,0,255)=
">xorxes: I wouldn&#39;t restrict it to lines. A line can be perpendicular =
to a plane, and also it should be usable with general objects</span>.<br><b=
r><span style=3D"font-family:courier new,monospace">If you think sraji work=
s, <br>then I suggest that it could be used for general objects, <br>and a =
different word could be used for lines and planes.</span><br><font face=3D"=
courier new,monospace">The relationship of two lines or planes forming <br>=
four equal angles seems unique.<br></font></div></blockquote><div><br></div=
><div>I&#39;m not sure what the advantage would be of having a separate wor=
d, but brivla space is infinite, so it is possible to create words as nuanc=
ed as one wants. If people will bother to learn and stick to such fine dist=
inctions is another issue. The same will happen with all geometric words. C=
an a cookie be cukla, or do we need one word for circle and a separate word=
 for circular object? The gismu list is not very consistent here (as usual)=
. For example &quot;bolci&quot; has a place for its material, so apparently=
 it excludes the abstract sphere. =C2=A0</div><div><br></div><div>mu&#39;o =
mi&#39;e xorxes</div><div><br></div></div></div></div>

<p></p>

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