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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.
Barrel is off an 870LW Special Field 20ga... 2-3/4" or 3".... Its 21" long...silver mid bead, white front bead.. Improved Cylinder......Excellent lightly used condition..
Asking 250 shipped/insured....offers considered...
Selling one of my 1100 Upland Specials...It is a 12ga...21" IMPROVED barrel with silver mid bead and white front bead....Gun was used very little...super clean inside and out...
The for-end has a tiny hairline grain crack on the left side (see pic), which I have been told is fairly common on...
Up for sale, Southwest Washington, Vancouver area, Clark county area.
Forster No-Go and Field chamber gauges. .308 Win. And .243 Win.
1 No Go, 1 Field.
These are valuable to use if you're installing a new barrel. Or a new bolt or BCG. To make sure you don't have excessive headspace. I used...
Sold pending funds..
Caldwell dead shot field pod.
This is essentially new. Purchase by a friend who is in a wheelchair it was set up but never used, he couldn't get close enough to shoot off it.
Shoulder or suitcase type arrangement. Holds more boxes of shells than I could carry. Nice pockets for eyes, ears and gloves. Very nice leather trim. They don’t make this one anymore. Can ship.
Freedom Arms 454 Casull Field Grade.
Very nice condition. 1/2 price of new. 7” Barrel
If you are knowledgeable about Freedom Arms then you know about the extreme quality of their firearms. $1500.00 plus $65.00 to ship to your FFL
Washed once. Set was too big. Had to go a size smaller pants and top.
Top had nametapes and rank been but is removed now.
Top: MR
pants: 34R
$370 shipped or $360 local.
Prefer a 20ga but will consider a 12
Condition not a huge deal but must be decent with no cracks…
will buy outright or have some interesting trade items as well..
Hello decided to post the shotgun again to see what I can get as a trade
Open to any offers
Handguns
Lever actions
Bolt actions
shotgun
Ammo(9mm, 223/5.56, 7.62x39, 12 ga)
Weapon lights
Optics
triggers(pcc, or ar 15)
uppers(pcc or ar15/300blackout)
vest with body armor
Steel targets
Grandma's...
I just learned of this today
law enforcement has the right to search your private lands in open fields and wooded areas and is not in violation of the 4th Amendment
as per a Supreme Cort ruling in 1924
https://congressionalsportsmen.org/policy/open-fields-doctrine/
this means law enforcement can...
I am trying to help someone sell a couple rifles and this is the first one they have available.
Western Field Model SB-712 in 30-30 Winchester
Bolt action, magazine fed, 22" barrel in good condition as seen in pictures.
Also has a Bushnell Scopechief IV in 3X-9X
Having trouble finding any...
Crye Precision G3 Field Shirt XL R in MULTICAM BLACK.
Great condition.
Photo looks faded but color is very dark. not faded at all.
Plus
Blackhawk Warrior Wear Jacket XL Green.
Photo makes it look tan but it if more air force green good condition. Clearly my camera sucks.
$120 for both