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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.
Springfield HellCat looking to sell.
Only has about 100 rounds put into it.
Looking to sell for something a little bigger
Have 2 both 15 round mags
Have all the original packaging.
Shipping and FFL fees paid by buyer.
Color: FDE
Hello All, I will get pictures posted soon, but wanted to get this post up while it is on my mind. I am looking to sell or trade my Mossberg 500 Pump 12 gauge Field/Deer Combo. Comes with a slug barrel and a shot barrel. Slug barrel has a Cabela's scope on it. I just never shoot it. Bought it in...
Has come up before. There is no field for "Wanted Ad Type" and I cannot post unless I check the (nonexistent) field for wanted ad type. What's worse is if I add a screen shot to show the missing field, "something" recognizes that I have not checked the wanted ad type, and I cannot post the thread!
Bought this many years ago. Never use it (I think it's been fore maybe 200 rounds through it in 10(ish) years. Looking to fund a new venture.
GB has a few walnuts from 750-1k. I'm asking $800, if I'm way off please feel free to DM me and we can discuss.
This is a Ted Blocker 610 revolver holster which was hardly used for my Smith & Wesson Pre Model 10 K Frame that I had cut down from a 4" to 2". The holster has a 1.75" tunnel belt loop and a thumb break for added security. During the re-stain process after the holster was cut down, a small...
Got this in a 3 way trade and have no use for it. Seems new but don't know history of it.
Stripped Agency Gen3 G19 Field Battle Slide. Channel liner installed and comes with guide rod.
No trades.
$800 shipped.
Winchester WSF Super Field Ball Powder for Reloading Almost 8 Pounds
7 Pounds 10 ounces so it has been opened.
Powder is good and has been stored correctly
$200
Face to Face FTF Fishers Landing Fred Meyer on se 164th Av East Vancouver ///// Or if we can meet up when I'm out and about I like to...
Selling a Mossberg 500 field with wood furniture and a 28” barrel. Chambered in 12 gauge for 2 3/4” and 3” shells. Comes with original box and accu-choke set. Able to meet up anywhere from Beaverton to Battle Ground. FTF at buyers choice of FFL.
Below is more info, but this is BRAND NEW. I did take the tags off...before realizing I had already bought this same jacket a couple years ago! Arktis makes amazing gear for the military in the UK. But, it was never worn and has been hanging in my closet since I purchased it. Best price on...
Mossberg 500 Field 12 gauge, blued 28” barrel, with interchangeable matte 18.5” security barrel. In excellent shape, been out in the field a few times but cleaned and well cared for. No problems or concerns at all, runs great. I've got two twelve gauge pumps, trying to consolidate them down to...
Prefer to meet in Multnomah county. Have FFL in West Linn but feel free to choose - buyer pays transfer.
Not looking for trades currently.
Hard cases available for $50.
Feel free to ask questions. Thanks for taking a look.