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dual
In geometry, every polyhedron is associated with a second dual structure, where the vertices of one correspond to the faces of the other, and the edges between pairs of vertices of one correspond to the edges between pairs of faces of the other. Such dual figures remain combinatorial or abstract polyhedra, but not all can also be constructed as geometric polyhedra. Starting with any given polyhedron, the dual of its dual is the original polyhedron.
Duality preserves the symmetries of a polyhedron. Therefore, for many classes of polyhedra defined by their symmetries, the duals belong to a corresponding symmetry class. For example, the regular polyhedra – the (convex) Platonic solids and (star) Kepler–Poinsot polyhedra – form dual pairs, where the regular tetrahedron is self-dual. The dual of an isogonal polyhedron (one in which any two vertices are equivalent under symmetries of the polyhedron) is an isohedral polyhedron (one in which any two faces are equivalent [...]), and vice versa. The dual of an isotoxal polyhedron (one in which any two edges are equivalent [...]) is also isotoxal.
Duality is closely related to polar reciprocity, a geometric transformation that, when applied to a convex polyhedron, realizes the dual polyhedron as another convex polyhedron.
Up for sale I have a US Optics SR-8C with C2Mil reticle, which is a 1-8x FFP scope with a SFP red dot. This means that no matter what magnification you are on you will always have a 2 moa red dot and the hash marks will never change distance relative to magnification. Both the elevation and...
Runs on gas or propane.
I've only ever used it during the servicr/maintenance recommendations. (Run for 10 mins every 2 months if not in normal use)
I've only ever ran ethanol free (clear gas) through it and it's been stored in my garage the whole time. I bought it new 2 years ago for...
Champion Inverter generator (#200988) DUAL FUEL
New, out of box Less that .3hrs ran. On propane, No gas use.
Electric start. Lithium Battery
4500 starting watts /3500 running
Nice, clean full sine power.
Great 30amp, RV ready generator, even for the A/C
Eco Mode, Super Quiet 61 db
Nice...
New, in the box.
Champion 4500 Dual Fuel Inverter generator. #200988 Runs on gas or std. propane bottle. super quiet. 61db. . Clean power, . Trade?
$750
Inherited 2 of these from a family member. Plan to keep one and let one go.
Very clean tube . Built in IR illuminator. Lightly used but very well cared for, never flashed or stored with battery installed. I've only used this to lap around my property a few times and go on a few night hikes...
I am a big fan of side charging AR uppers. I also own a bunch of standard rear charging AR uppers. I haven't bought any dual charging ARs but might soon.
For those who own a dual charging upper which charger do you use most often when using the upper?
Example of one I am looking at buying...
ULTIMATE Langdon Beretta ROBOCOP 92FS-M9A1 Dual Uppers 9MM
This is the ultimate Beretta setup. Lots of time, money, and planning went into this build to make it the absolute pinnacle of the 92 platform. It has everything you can possibly do to upgrade the Beretta 92 platform. This is the...
Model 200961 2500-Watt Dual Fuel Portable Inverter Generator, Ultralight
From the manufacturer: "Our 2500-watt inverter is one of the lightest in the industry and features Dual Fuel allowing the 79cc engine to run on gasoline or propane. Enjoy the quiet 53 dBA for up to 11.5 hours on gasoline...
Up for sale is 2 quest dehumidifiers
Both are 110v dual 155 asking 1200$ each Or 2200$ for the pair of 155's
They are in good working shape they currently have the feet removed so they don't get damaged but do have some scuffs on the bottom because of that. Currently located in milwaukie oregon...
Brand new items! Bought these last year, but never used them. In addition to the communication capability, this headset provide great hearing protection The retail price on the comms is $770 and helmet mount is $100. Buy these now and save a bunch of money!
The detailed specs are as follows...