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Subject: Re: [lojban] Re: Direction of Rotation
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> But you still need to specify which thumb.

The right one; that's why it's a right hand rule.

> Is there no escape from this?

No, there isn't; as aionus pointed out, you need a reference frame.

>
> ________________________________
> From: .arpis. <rpglover64+jbobau@gmail.com>
> To: lojban@googlegroups.com
> Sent: Sunday, August 12, 2012 10:34 AM
> Subject: Re: [lojban] Re: Direction of Rotation
>
> Right hand rules are a series of mnemonics (usually taught in physics)
> for remembering the arbitrary but consistent directions and sign
> choices. An example: If the current is flowing in the direction of
> your thumb, the electric field is in the direction of your fingers (on
> the right hand).
> Left hand rules can be used, but negate one sign (in the math
> representation) relative to the right hand rules.
>
> A useful right hand rule for lojban might be "the direction your
> fingers curl when you point your right thumb at your face"
>
> On Sun, Aug 12, 2012 at 3:04 AM, Gleki Arxokuna
> <gleki.is.my.name@gmail.com> wrote:
>> So Robin entered right-hand rule to Gismu issues page.
>>
>> Can you provide some examples of it's usage with all places filled in? Is
>> it
>> culturally-neutral (both left and right direction can be equally used)?
>>
>> btw, lindar started this topic because he NEEDED a way of expressing the
>> concept of "clockwise".
>>
>> doi loi jbobadna, where are the examples after all?
>>
>> On Sunday, August 12, 2012 12:34:00 AM UTC+4, aionys wrote:
>>>
>>>
>>>
>>> On Sat, Aug 11, 2012 at 10:11 AM, djandus <jan...@gmail.com> wrote:
>>>>
>>>> I don't have time to go over every post in this thread, especially
>>>> seeing
>>>> as it is rather full of people getting offended.
>>>>
>>>> Has anyone brought up the right-hand rule? (for rotations)
>>>>
>>>> That is, for the wheels on a car, I could say:
>>>> {lo karce xislu cu carna zo'e lo zunle be lo karce}
>>>> because if you were to stick your right thumb to the car's left, your
>>>> fingers would curl around in the direction of rotation. This is
>>>> consistent
>>>> with the overall standard of the right-hand rule, which comes up on this
>>>> topic via the cross product definition of angular motion. That is, if I
>>>> were
>>>> to be asked the "direction" of the angular motion, momentum, or similar,
>>>> it
>>>> would be to the car's left. This is arbitrary, but completely
>>>> standardized
>>>> in physics.
>>>
>>>
>>> I believe Pierre did, yes.
>>>
>>>>
>>>> Similarly, I would say that a top would be {carna zo'e lo gapru} if it
>>>> were spinning counter-clockwise when viewed from above. If I were to
>>>> instruct one to remove a screw, I could say {ko cargau lo klupe ku zo'e
>>>> lo
>>>> bartu}, because the direction a screw moves and the direction it needs
>>>> to
>>>> rotate correspond by the same standard right-hand rule. If I were to use
>>>> the
>>>> carna2 spot, the axis would probably be defined with a direction as
>>>> "positive," after which I could then use {li ni'u}/{li ma'u} in carna3.
>>>> (This would be the establisment of a coordinate system.) If the axis was
>>>> given descriptively without a direction, then my other examples
>>>> illustrate
>>>> how I would deal with that.
>>>>
>>>> Is there anything terribly wrong with these examples?
>>>> mu'o mi'e djos
>>>
>>>
>>> I don't see anything.
>>>
>>> --
>>> mu'o mi'e .aionys.
>>>
>>> .i.e'ucai ko cmima lo pilno be denpa bu .i doi.luk. mi patfu do zo'o
>>> (Come to the Dot Side! Luke, I am your father. :D )
>>>
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>
>
>
> --
> mu'o mi'e .arpis.
>
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-- 
mu'o mi'e .arpis.

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