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Old Apr 13th 2018, 05:28 AM   #11
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Originally Posted by htam9876 View Post
dear sir :
a line could extend in two direction ,the question is two uncertainty ,one uncertainty,which one do you favour? we discuss not a line so simple,sorry sir
First off, a line is a one dimensional object regardless of anybody's opinion. Second a straight line points in a single direction regardless of what you believe.
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Old Apr 14th 2018, 05:17 AM   #12
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Lets not get our knickers in a twist here and remember that Htam's first language is not English.

However whatever languague you use for Mathematics it should be more exact.


In geometry a line extends to infinity or itersects itself.

Part of a line is called a line segment.

As such a general line has no direction in relation to the coordinate axes but may be traversed forwards or backwards.
A positive or negative sign is usually used to indicate this, when it is important.
A line segment with such sign attached is called a directed line segment.

Directed line segments form the underlying theory for geometric vectors.

If the line is a straight line in Euclidian geometry it has 3 direction cosines (h, l and m), which satisfy a general equation


$\displaystyle {h^2} + {l^2} + {m^2} = 1$


A self intersecting line forms a closed loop which bounds a gaussian surface.
Such a surface has two sides, which may be represented by a directed line segment.

Now, Htam, please outline what it is you want to say in a short paragraph, without reference to anything off site.
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Old Apr 14th 2018, 05:49 AM   #13
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No knickers were injured during my post. I know English is not his fl. That was part of the reason I wrote what I did. Why might have you assumed otherwise?
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Old Apr 14th 2018, 06:14 AM   #14
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Originally Posted by Pmb View Post
No knickers were injured during my post. I know English is not his fl. That was part of the reason I wrote what I did. Why might have you assumed otherwise?
Actually I was speaking in the plural (including the OP), not identifying any particular individual.

I am really trying to distinguish between a situation where the OP's real meaning is obscured through language and he can therefore be helped,
and where the real meaning is due to some personal belief or conception that is at least unusual, where help is much more difficult.
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Old Apr 14th 2018, 06:51 AM   #15
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Nice message studiot. I took you off my ignore list.

In the future I recommend that all posters avoid ad hominems and criticize posts rather that posters ...... me included of course.

A while back you were really irritated when I said you aren't a professional physicist. It was merely a description and nothing else. If someone said I wasn't a professional engineer I wouldn't care at all.

Mind if I ask what your degree, if any, is in? Feel free to pm me on it
I'm very trustworthy.
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Old Apr 14th 2018, 08:04 AM   #16
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Mind if I ask what your degree, if any, is in? Feel free to pm me on it
I'm very trustworthy.
First degree: Applied Mathematics

Postgraduate: Hydrographic Surveying, Marine Geodesy and GeoPhysics.
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Old Apr 14th 2018, 10:58 AM   #17
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Originally Posted by studiot View Post
First degree: Applied Mathematics

Postgraduate: Hydrographic Surveying, Marine Geodesy and GeoPhysics.
Most impressive!

-Dan
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Old Apr 14th 2018, 03:14 PM   #18
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Thanks, Dan.

Plymouth School of Maritime Studies was not a normal academic institution when I was there (it is now part of Plymouth University), but was probably the foremost institution in the world for marine qualifications- eg Master Mariner.
It also awarded this specialist postgrad diploma part Navy, part commercial.

Other bodies in the UK had this sort of status in those days eg the Royal College of Military Science at Shrivenham.

We have thrown away so much in this country.
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Old Apr 16th 2018, 03:02 AM   #19
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physics

Navy, I like, there is a Chinese song 军港之夜,the wave,the wind,the warship,and the dream of solders...it's so beatiful

Last edited by htam9876; Apr 16th 2018 at 04:58 PM. Reason: accurate
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Old Apr 16th 2018, 10:39 AM   #20
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Thanks, Benit.

Which bit in particular did you like?

If it was the last line, we used to have so many such institutions, I remember one flatmate of my brother who was dooing his Phd in Physics at the Building Research Station (as it was then when I worked there in the late 1960s).

More that I can remember were TRL, Cranfield, Wallingford, AWRE, RRE, Dundee, Julian Hirsch Centre, Wimpeylabs, Cannington, Brixham to name but a few.
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