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The Pullback Equation for Differential Forms

Csató, Gyula / Kneuss, Olivier / Dacorogna, Bernard
The Pullback Equation for Differential Forms
An important question in geometry and analysis is to know when two k-forms f and g are equivalent through a change of variables. The problem is therefore to find a map φ so that it satisfies the pullback equation: φ*(g) = f. In more physical terms, the question under consideration can be seen as a problem of mass transportation. The problem has received considerable attention in the cases k = 2 and k = n, but much less when 3 ≤ k ≤ n–1. The pr...

CHF 157.00

Celestial Delights

Reddy, Francis
Celestial Delights
Celestial Delights is the essential 'TV Guide' for the sky. Through extensive graphics integrated with an eight-year-long calendar of sky events, it provides a look at "don't miss" sky events, mostly for naked-eye and binocular observing. It is organized by ease of observation – lunar phases and the brighter planets come first, with solar eclipses, the aurora, and comets coming later.This third edition also includes a hefty dose of sky lore, a...

CHF 52.90