Join the #1 community for gun owners of the Northwest
We believe the 2nd Amendment is best defended through grass-roots organization, education, and advocacy centered around individual gun owners. It is our mission to encourage, organize, and support these efforts throughout Oregon, Washington, Idaho, Montana, and Wyoming.
Discuss firearms and all aspects of firearm ownership
Join others in organizing against anti-gun legislation
Find nearby gun shops, ranges, training, and other resources
Discover free outdoor shooting areas
Stay up to date on firearm-related events
Share photos and video with other members
...and much more!
1-4
The infinite series whose terms are the natural numbers 1 + 2 + 3 + 4 + ⋯ is a divergent series. The nth partial sum of the series is the triangular number
which increases without bound as n goes to infinity. Because the sequence of partial sums fails to converge to a finite limit, the series does not have a sum.
Although the series seems at first sight not to have any meaningful value at all, it can be manipulated to yield a number of mathematically interesting results, some of which have applications in other fields such as complex analysis, quantum field theory, and string theory. Many summation methods are used in mathematics to assign numerical values even to a divergent series. In particular, the methods of zeta function regularization and Ramanujan summation assign the series a value of −1/12, which is expressed by a famous formula:
1
+
2
+
3
+
4
+
⋯
=
−
1
12
,
{\displaystyle 1+2+3+4+\cdots =-{\frac {1}{12}},}
where the left hand side has to be interpreted as being the value obtained by using one of the aforementioned summation methods and not as the sum of an infinite series in its usual meaning.
In a monograph on moonshine theory, Terry Gannon calls this equation "one of the most remarkable formulae in science".
Photo does not accurately depict wear. It has some wear marks, but the barrel itself hasn’t had very many rounds through it. It was a Gen 3 nitride coating and it has wearmarks. Rifling is in good condition
$50 in Eugene or Best offer Trade for Glock 9mm parts and accessories possibly
This is a super high quality setup for a short to medium range rifle. Very compact and lightweight.
Together, the mount and optic weight 24.25 ounces. That is less than some 1-4's weight alone. This combo has a very low round count. I am only selling because I have too many toys and I am trying...
debating selling my Steiner military 1-4x24, in perfect condition with bobro qd Mount, , would be possibly interested in an exps3 with magnifier/acog/Browe, etc.., if I have to name a price 900$ Mill, sfp, daylight bright reticle
I'm building an ar platform in .450 bushmaster and am looking for a decent 1-4 scope to put on it that's not overly expensive but not crap either. What suggestions do you guys have ?
For Sale:
A like new (with original box and paperwork) Steiner P4XI 1-4x variable power scope, illuminated, throw lever w/ Bobro Precision 30mm single QD lever mount.
Price: $550
Location: Tacoma
New still in wrapper
Looking to sell/trade a few things that I will be posting in the next few hours. Looking for cash or trade for glock parts that will work with a 19x, barrel, trigger springs, mags, magwell. A 1-8 vortex strike Eagle. A rifle suitable for my boy, teenager, to go hunting...
Vortex viper PST 1-4×24 mil/mil has throw lever and comes with rings. In great shape and of course the vortex warranty. Asking 425 plus shipping if needed.
Trade for eotech exps2-0 or -2
SOLD
Obviously used and painted Bushnell AR 223 1-4x24 Scope with BTR-1 reticle for sale. Has had approximately 300 rounds shot with it. Great scope, never lost zero - just upgraded to a different optic. Clean glass, no scratches. $100 shipped. Paypal only - Buyer pays any fees.