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In mathematics, a proof is an inferential argument for a mathematical statement. In the argument, other previously established statements, such as theorems, can be used. In principle, a proof can be traced back to self-evident or assumed statements, known as axioms, along with accepted rules of inference. Axioms may be treated as conditions that must be met before the statement applies. Proofs are examples of exhaustive deductive reasoning or inductive reasoning and are distinguished from empirical arguments or non-exhaustive inductive reasoning (or "reasonable expectation"). A proof must demonstrate that a statement is always true (occasionally by listing all possible cases and showing that it holds in each), rather than enumerate many confirmatory cases. An unproved proposition that is believed to be true is known as a conjecture.
Proofs employ logic but usually include some amount of natural language which usually admits some ambiguity. In fact, the vast majority of proofs in written mathematics can be considered as applications of rigorous informal logic. Purely formal proofs, written in symbolic language instead of natural language, are considered in proof theory. The distinction between formal and informal proofs has led to much examination of current and historical mathematical practice, quasi-empiricism in mathematics, and so-called folk mathematics (in both senses of that term). The philosophy of mathematics is concerned with the role of language and logic in proofs, and mathematics as a language.
I'm selling my AR 10, 308 Win build. I'm a student at PSU and just don't have the time to get into shooting right now. The gun doesn't have a single round through it yet. My goal for this gun was to be a precision shooter while also being lightweight for hunting. Gun weight without an optic or...
For sale is a custom rifle chambered in 6.5 Creedmoor. The action is a trued Remington 700 short action. The trigger is a Trigger Tech Special set to 2- 2.5lbs. The barrel is a Proof Research barrel cut to 22" and threaded at the muzzle in 5/8x24. The stock is a Greyboe Ridgeback with a matching...
**update** the scope has been sold which means I have a custom rifle that is perfect for someone looking to get into long-range shooting or competition. The rifle began life as an R700 AAC Tactical since I had the action trued and re-barrelled in 6.5CM with a Proof Research stainless M24 contour...
Custom Larue 762/308
16” proof research Carbon wrapped barrel
SA adjustable gas block
Wilson Combat 15” MLOK rail
JP high pressure Bolt (headspaced to proof barrel)
SiCo muzzle brake
B5 systems adjustable stock
This is a true custom gun and not some budget garage build. It is built for...
As stated in title selling .308 carbon fiber barrel blank. This is a blank and will need to be fitted to your action and crowned by a competent gunsmith. Cash face to face sale, will not ship, not interested in trades. I will make fun of you if you offer trades. Barrel specs below.
Up for sale is a used Proof Research sendero contour 22 inch barrel chambered in 338 Ruger Compact Magnum. It has a Savage large shank barrel tenon. I bought this barrel used and do not know round count but as it is chambered in a fairly obscure caliber and in perfect shape, I think it’s very...
I have a brand new 18” Proof Research Carbon Fiber Barrel. Never been installed on a rifle and never had a round through the chamber. It’s chambered in .223 Wylde w/ 1:8 Twist. This is a beautiful Barrel I bought for a build and decided to go another direction. This barrel MSRPs for $920. This...
Washington also, anyone want to do some trading, built this a couple years ago but never shoot it, has about 300 rounds through it, seekins sp223 lower and cmt upper, proof research 16” carbon fiber barrel 1/8 twist nato chamber, 2a armament ti has block, vseven titanium safety, take down pins...
I’ve been wanting a 1000yd + rifle and was ready to get a 300 win mag, when I came across the 6.5 Creedmoor. So after hours....okay days, of reading up on it I started the build.
Gibbz G10 latching side charging upper
AERO lower w CMMG parts kit
Proof Research 24in 6.5 CM
i have a new in box proof research carbon fiber barrel for a bolt gun. Its 26" sendero contour in .264 1:8 twist. shank diameter is 1.200
I was going to use it for a 6.5x47L build, but it was backordered at the time, so i went another route on the barrel.
Full custom built 300 WSM
Defiance deviant hunter action
Proof Research Carbon fiber 20" bull barrel 23" with the muzzle break
APA muzzle break
Timney CE trigger
Manners EH4 stock
Surgeon bottem metal with drop out mag
less than 40 rounds fired
Have three other full proof research builds so...