The new Arai Vector 2 is a careful evolution of the original Arai Vector (review), with a few new tweaks to make it…better, of course! The ultra-plush Arai interior is still there (thank you!) while ...

Cylindrical and spherical coordinates, double and triple integrals, line and surface integrals. Change of variables in multiple integrals; gradient, divergence, and ...

Back in 1948, the journal Physical Review published a paper entitled “Space-Time Approach to Quantum Electrodynamics” by a young physicist named R.P. Feynman at Cornell University. The paper described ...

At that time, the Vector 2 was a brand-new update to the original Arai Vector (review) of 2007. The Vector 2 has the Arai “Intermediate Oval” internal shape; i.e., what we call “Neutral” to “Slightly ...