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with rings
In mathematics, rings are algebraic structures that generalize fields: multiplication need not be commutative and multiplicative inverses need not exist. In other words, a ring is a set equipped with two binary operations satisfying properties analogous to those of addition and multiplication of integers. Ring elements may be numbers such as integers or complex numbers, but they may also be non-numerical objects such as polynomials, square matrices, functions, and power series.
Formally, a ring is an abelian group whose operation is called addition, with a second binary operation called multiplication that is associative, is distributive over the addition operation, and has a multiplicative identity element. (Some authors use the term "ring" to refer to the more general structure that omits this last requirement; see § Notes on the definition.)
Whether a ring is commutative (that is, whether the order in which two elements are multiplied might change the result) has profound implications on its behavior. Commutative algebra, the theory of commutative rings, is a major branch of ring theory. Its development has been greatly influenced by problems and ideas of algebraic number theory and algebraic geometry. The simplest commutative rings are those that admit division by non-zero elements; such rings are called fields.
Examples of commutative rings include the set of integers with their standard addition and multiplication, the set of polynomials with their addition and multiplication, the coordinate ring of an affine algebraic variety, and the ring of integers of a number field. Examples of noncommutative rings include the ring of n × n real square matrices with n ≥ 2, group rings in representation theory, operator algebras in functional analysis, rings of differential operators, and cohomology rings in topology.
The conceptualization of rings spanned the 1870s to the 1920s, with key contributions by Dedekind, Hilbert, Fraenkel, and Noether. Rings were first formalized as a generalization of Dedekind domains that occur in number theory, and of polynomial rings and rings of invariants that occur in algebraic geometry and invariant theory. They later proved useful in other branches of mathematics such as geometry and analysis.
Close to new Warne 1-Piece Gen 2 Extended SKEL MSR Scope Mount Picatinny-Style with Rings, mounted on a few safe queens, so the only wear is on the mounting hardware from jumping around from gun to gun.. 30mm size. Moving the scope over to a bolt action, so this mount would look ridiculous...
Clearing out storage and would like to find a home for two optics. 1) Tasco "World Class" 3-9x40 w/30-30 reticle. Honestly, its a solid little unit with much better clarity than it's brothers - the Bushnell Banner line of optics. 2) Barska 6-24x42 AO. Decent unit with a decent BDC reticle...
This came to me on a blue 22 and just didn't look right on a blued rifle. Perfect for your stainless/silver 22, and the price is right. Perfect condition and clear glass.
$45 picked up near Molalla. I will ship at cost.
Would also trade for something you have and I might need. Always open to...
Up for sale, Southwest Washington, Vancouver area, Clark county area.
Weaver Classic. 4 x 38 rifle scope. Made in Japan. Duplex reticle. Fixed 4 power. Lightweight, crisp and clear optics.
Selling scope and mount together for $100 cash.
Send Conversation, Private message, if interested.
Vortex crossfire 2 4-12x44 bdc with rings
Brand new, no box, came from my recent savage 110 purchased, asking for $120, can ship for extra $10
Sell or trade to 600 rounds of 9mm.
Vortex pst gen 2 5-25x50 ffp mrad with rings - selling for $680 or trade to eotech exps 2-0 and g33 magnifier combo or acog.
Willing to ship on your dime.
Helping a friend sell this scope. Great deal.
VORTEX VIPER PST GEN II 5-25X50 FFP RIFLESCOPE, EBR-2C MRAD RETICLE – PST-5258
Illuminated reticle with 10 intensity levels
Fog proof using Argon gas purging
ArmorTek scratch-resistant hard coating
Magnification: 5-25 x
Objective Lens Diameter...
I'm selling my Vortex Razor HD Gen II 4.5-27x56 EBR-7C MOA because I sold the rifle and the scope needs to go to a good home.
Works great! Comes with throw lever, sunshade, neoprene scope cover, Seekins Precision Rings and the box of course.
Hello, got this on my bolt action when I bought it but put swapped out for my vortex. This is brand new and ready to install. Would like to me FTF in Hillsboro.
***Trade Pending***
In excellent to like new condition. I have a set of Leupold Rifleman tall rings and Butler Creek flip-up caps on it. No box or paperwork. This was on my AR for all of one range session. I replaced it with a 2-7x33. I was going to mount it on my 10/22 but then tradedoff my...
Hi all,
Have a Vortex 4-16x44 with rings and front cover that am looking to sell. Sold the rifle and do not have a use for this glass at this time. VMR-1 MOA reticle, Second Focal Plane.
No issues, just no use. Priced to move as I don't think it has any range time (prior owner never shot...
NIKON PROSTAFF 4-12X 40MM OBJ 23.6-7.9 FT @ 100 YDS FOV 1" TUBE BLACK MATTE BDC. This scope was great, I had a great time running it on my AR, just upgraded to something a little nicer so no need for me to keep it. It’s in really good shape, never used it for anything besides a bench gun so it’s...
*Sold Pending Funds*
Like New with original box - what the brochure says about it:
"The 4-12x40 Revolution Riflescope from Redfield (model # 67110) features a weather-sealed housing and 4-Plex crosshair reticle. This mid-range scope uses Redfield's Illuminator Lens System to produce...
Bought on a whim from another member and haven't used it myself.
The BSA® Sweet .22 AO Rifle Scope is specifically designed for the .22LR. Complete with 3 ballistically calibrated turrets for 36gr, 38gr, and 40 gr cartridges, the Sweet 22 AO also features an adjustable objective, fully coated...
WTS Nightforce Enhanced ATACR 5-25x56 MOAR Digillum C553 $2300
Rings: Nightforce X-treme Duty UltraLite Unimount 1.5" COMPACT MAG 20 MOA 34mm A362, included with scope
Will post more photos if wanted.
Located in Covington will travel aways, not interested in trades.
Currently attached to an...
Older mark ar 1.5-4 with basic duplex reticle.
Comes with warne low rings.
$150
NO TRADES
NO SHIPPING
NO DELIVERY
NO TEST FIRE
FTF IN NW HILLSBORO AREAS TO BANKS
Thanks for looking!
Reno