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field
In mathematics, a field is a set on which addition, subtraction, multiplication, and division are defined and behave as the corresponding operations on rational and real numbers do. A field is thus a fundamental algebraic structure which is widely used in algebra, number theory, and many other areas of mathematics.
The best known fields are the field of rational numbers, the field of real numbers and the field of complex numbers. Many other fields, such as fields of rational functions, algebraic function fields, algebraic number fields, and p-adic fields are commonly used and studied in mathematics, particularly in number theory and algebraic geometry. Most cryptographic protocols rely on finite fields, i.e., fields with finitely many elements.
The relation of two fields is expressed by the notion of a field extension. Galois theory, initiated by Évariste Galois in the 1830s, is devoted to understanding the symmetries of field extensions. Among other results, this theory shows that angle trisection and squaring the circle cannot be done with a compass and straightedge. Moreover, it shows that quintic equations are, in general, algebraically unsolvable.
Fields serve as foundational notions in several mathematical domains. This includes different branches of mathematical analysis, which are based on fields with additional structure. Basic theorems in analysis hinge on the structural properties of the field of real numbers. Most importantly for algebraic purposes, any field may be used as the scalars for a vector space, which is the standard general context for linear algebra. Number fields, the siblings of the field of rational numbers, are studied in depth in number theory. Function fields can help describe properties of geometric objects.
Up for sale, Southwest Washington, Vancouver area, Clark, County area.
Kabar, BK62 fieldcraft, hunting, knife. Full tang.
2 sets of grips, walnut and micarta. (Extra grips were $49). With leather sheath.
Very well balanced, and dependable knife.
New in box. Never used...
I built this to use in the back of my UTV to roll out field fence, it worked good, and now I’m done with it. It goes in any 2” receiver and is adjustable height, the blue disk screws onto the stud, set a roll of fence on it, then screw the 6” pipe in the center, anchor an end of the fence and...
Excellent shape classic Mossberg 500 12G pump shotgun for sale. Bought new in about 2019, light use. One turkey hunt and under 200 shells through it, always cleaned and oiled. No rust, stock and fore end are in great shape. Just got too many shotguns, if you can believe it.
Comes with 28" field...
I have a very low round count Xd 45 4” barrel full size pistol only has about 150 rounds threw it comes with case and everything in the picture
All three mags are 13 round mags
Asking 250$ buyer covers transfer
Getting out of 45acp
Prefer to sale in state only - Oregon
I'm selling a Maverick 88 Field and Security combo 12 gauge in great condition. Only shot it a few times but never got into it. Comes with all the chokes and 200 rounds of birdshot. I'll post pictures tomorrow after work.
Thanks for looking.
Like new. Got this to use in my yard but its way to powerful for me to use in my small yard. It is internally suppressed so its very quiet. Check the reviews this is a pretty amazing rifle.
This is not the base Marauder, this has a regulator that keeps shot power the same and delivers more...
Lowered to $475
Now looking for a Ruger M77 Alaskan or Guide Gun!
I recently got this from another member, and had plans to Randy Weaver it, but I can't bring myself to doing that to such a cool old gun.
Serial dates this to about 1914, it has "armor steel" 30" barrels that are likely choked...
Never fired CZ Shotgun for sale. I bought this before the bill passed with the intent to start sport shooting but have since gotten engaged and need to save up for a wedding. Comes with all the chokes, the evolution rawhide bag pictured, and I have some target ammo fresh boxes as well as a...
Well….
Never in my 28+ years as a field tech, repair/installation tech and mostly a troubleshooting tech did I think I would want to give up the tools and find myself a project (or whatnot) manager job and be the guy coordinating things. At least that is the thing that makes the most sense...
Selling my unused, never carried Toor outdoor series fixed blade, finished in Spanish moss. I love this knife but the handle is too small for my hand and I can't wield it comfortably which is unfortunate.
I purchased it direct from Toor 2 years ago and it has sat in the safe ever since, only...
For sale is this new Glock field knife, black with root saw cutters. Only taken out of the package to photograph. Made in Austria. Price is $35 and I would like to deal local but can ship on the buyers dime. Please PM me with questions or contact intel, I don't text.
unfired Mossberg 500 with wood stocks/ribbed 28" barrel 12 guage, been sitting in my safe as a spare for a while - asking $350 Price drop $300, buyer pays transfer - Comes with unopened choke set
FM 23-35 Dept of the Army Field Manual
AFM 50-17 Dept of the Air Force Manual
Pistols and Revolvers
July 1960
$10 cash obo
This is only one book, but both numbers are on it.