Quartic anharmonic oscillator with potential V(x)= x² + g²x⁴ was the first non-exactly-solvable problem tackled by the newly-written Schrödinger equation in 1926. Since that time thousands of articles have been published on the subject, mostly about the domain of small g² (weak coupling regime), although physics corresponds to g² ~ 1, and they were mostly about energies.This book is focused on studying eigenfunctions as a primary object for any g². Perturbation theory in g² for the logarithm of the wavefunction is matched to the true semiclassical expansion in powers of ℏ: it leads to locally-highly-accurate, uniform approximation valid for any g²∈[0,∞) for eigenfunctions and even more accurate results for eigenvalues. This method of matching can be easily extended to the general anharmonic oscillator as well as to the radial oscillators. Quartic, sextic and cubic (for radial case) oscillators are considered in detail as well as quartic double-well potential.
A tribute to Mexico’s most important holiday, this extraordinary and definitive volume documents the immense creativity displayed by this popular annual celebration. While there have been other books about the Day of the Dead, most are long out of print and aridly academic. This book features both exceptional “traditional” Indigenous material—such as vibrant folk art and crafts, flamboyant costumes and masks, special food and drink—but also a much more funky, modern approach that blends lively music and dance, colorful parades, cutting-edge contemporary street art, and a festive atmosphere that engages all of the senses with handmade altars, flowers, painted skulls, toys, paintings, murals, and other art objects. Featuring hundreds of specially commissioned photographs and voluminous in-depth research, the book is lavishly illustrated and designed with an aesthetic that draws on both traditional material as well as Mexico’s contemporary street art style. Blending visual elements inspired by the country’s pre-Hispanic heritage, European influences, and modern art trends, the book explores the evolution of the Day of the Dead and the special role it plays. This book is the definitive, authentic resource for all things Day of the Dead.
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