The more I think about it the more I realise the fundamental nature of the process I have called flip.
Flip is the sudden change of direction, orientation or evaluation as motion crosses a boundary marker.
The boundary marker has to be a measure Mark, and thus ideally a unit measure Mark. The units measured are magnitudes in the visual sensory mesh, or the bi aural bi olfactory sensory meshes for intensity magnitudes.
The flip is related to motion sense and direction of measured motion. So the process involves measuring magnitude from a measure Mark and sensing when that Mark has been reached, or a measure Mark has been reached. At that point the sensory mesh give a visible, tactile kinaesthetic response associated with the flip. This is how I know a plop is occurring.
At that stage I can redraft the flip response count it or finish the measurement..
The flip response keys me to continue using the same orientation or direction evaluation or indeed to "flip" to another orientation. Using this signal response I can measure motion and consider it the same in direction, or status until the flip.
Statices and directions I use are defined by me usually in binary distinctions:
Left right
Up down
Away to
Before after
Start finish
In out
On off
Here not here/there
Early late
Round up round down
Pass fail
Etc
In terms of rotation I can set a measure to flip to so for example flip to \pi/4 and flip back or flip another \pi/4
Flip begs the question? What do we do the flip for?
We do the flip for a stays dependent purpose.
So in computing we have choice points or if then statements and these provide a status dependent flip, or a conditional flip.
Depending on the condition or status flip controls subsequent activity or actions.
So now I have generalised the notion of flip and the flip marker. The flip marker may now in fact not be a Mark at all. It may just be a condition or status, used as a a test when to operate flip.
Once flip has been operated certain actions are associated.
Drilling back down to measuring I may operate a flip in direction of measurement or a flip to the next numeral count when a certain condition or Mark is met.
How does this apply to negative numbers?
Brahmagupta set out a condition for a magnitude to be yoked to it's paired unit. The condition is that they both come out of shunaya and when they meet they return to shunaya.
So the flip is shunaya is cut and has a magnitude removed leaving a gaping hole of the magnitude that has been removed. So the yoked pair is the magnitude and the hole. The magnitude and the hole can exist but not independently. The flip is proximity of motion. If they collide the flip is activated and the action is to annihilate them, that is return them both to shunaya.
So let's do this in Chinese. The Chinese had a red rod and a black rod and an account pot. If you paid money into your account a black rod went in. If you took money put of your pot a red rod went in . There'd rod was the flip, the action that followed was to take out equal red and black rod magnitudes. What remained was your account balance. This was a double entry bookkeeping system, if you like.
So now what if you were left with red rods in your account pot? Then you owed the bank money!
I think the Chinese used black as money paid out and red as money paid in.
So the flip condition was red and black together meant action needed to follow.
So finally to our system of negative scalars. The Italians used men and piu as part of the numeral attribute when accounting. The only thing they needed for this system was the actions to follow on the flip.
Brahmagupta had delineated these actions and Bombelli had reiterated them. The flip was aggregation of the monies credited and debited.the action was to annihilate equal magnitudes of men numerals with piu numerals.
-5*-5, -5*5 are presented as an oddity, which they are when written in notation, but in dealings they are clear if I give away five debts to someone else I am better off by that magnitude.it is the same as someone giving me that magnitude, that is piu that magnitude. Similarly giving away five credits leaves me worse off and is the same as accepting five debts, that is men that magnitude.
Let us not lose sight of the flip that occurs due to the condition debts and credits accruing and the action of accounting that follows the flip.in this case it is a delayed flip as the money going out is the flip to account,as is the money going in. We can action the flip immediately nowadays by computers, but in Bombelli's day the nearest thing to immediate reaction to the flip was double entry book keeping.
So the flip is dependent on the condition and action is dependent on the flip. This is a conditional algorithm, requiring a test to initiate. We can do this in cybernetic systems nowadays, but the significance here is that sign is a part of a conditional algorithm. Our fault has been to isolate it from it's conditional nature and to make out that it is a thing entire, extant in the world we call reality.Sign is part of a conditional algorithm and it is the first action of the flip: designate the sign.what then is the preceding condition or status?
I have identified several statuses above, each of which may be a preceding condition.
Concentrating on measurement, it being a vector, a dynamic magnitude I may want to measur motion in one direction as opposed to another. The condition is then the direction, and the flip occurs when I have to measure in a different direction. The flip enjoins me in an action: Mark these measurements differently, and aggregate them differently according to the rules of combination.
Several sloppy conventions have to be pointed out. Applying - to numerals permanently isolated the conditional nature of the sign. Secondly what worked for accounting did not work for geometry without additional conditions. These conditions were understood by artisans, who really had no need for them, but not by mathematicians that well until Wallis, Newton's tutor who adumbrated the number line concept. Geometrically sign had to apply only to measurements rotated by
radians to one another.
This made the condition a rotation of π radians measured from a rotational axis. This caused a flip, a change in notation and a change in final accounting.
In geometry it is natural to ask what do we do with measurements that are rotated by less than π? There was no "sign" given for that flip.
Although Bombelli did not know how to explain it as such he knew enough to realise he could extend the actions that were dependent on a flip to cover the case when finding radicles or roots of a geometric figure. Roots of a geometric figure are presented to us a mysterious things that drop out of equations.but in fact they are orthogonal sides of a geometric figure, not mysterious at all , and the equation merely gives the magnitude, not the root!
Thus the root for most geometric figures were known to exist by inspection, it was simply how to calculate the magnitude. The signed magnitude carried information about the measurement direction, and where the flip occured. What Cardano could not stomach was rooting negative numbers, he had no measure to make sense of it, bur Bombelli did. He had a carpenters square and this made perfect sense of rooting negative magnitudes by, in effect flipping it about using neusis. Bombelli even created a notation for it : piu di mene and men di mene. This notation was in fact a "sign" for dependent action the condition was rooting a negative magnitude the flip was to put this "sign" on it and the action was to use the bombelli operator to do the accounting or aggregation.
Because of the loathing of negative numbers it took a while for people to tackle the issue, and by then some confusion between the sign and the magnitude had been established. Thus i popularised by Euler was a mixture of sign and magnitude. The sign here represents measurements flipped
from the initial measurement direction. But the sign also represents magnitude, so it is not a pure sign like -. Once this was realised they made - into a mixed impure sign: a -1.
Several things can now be done: redefine sign in terms of a magnitude and a distinguisher. Restore the conditional flip. Define the dependent conditions and actions for each instance of sign. Generalise the notion of sign to cover every condition and specify the general flip and the general dependent actions.
This then makes i a sign and not an imaginary number and opens up the door for roots of unity.
i is the 4th root of unity and a dynamic magnitude having magnitude orientation, and rotation.