31. The existence of pullback homomorphisms in de Rham cohomology depends on the pullback of differential forms . 32. Differential forms are an approach for describing the geometry of surfaces in a coordinate independent way.33. It is often easier to work in differential form and then convert back to normal derivatives. 34. The paper showed that a germs of holomorphic functions, local rings, and differential forms . 35. Differential forms , the wedge product and the exterior derivative are independent of a choice of coordinates.36. Flux is the integral of a differential form and, consequently, a de Rham cohomology class. 37. The mathematics, primarily tensor calculus and differential forms in curved spacetime, is developed as required. 38. The product of differential forms is called the exterior or wedge product and often denoted \ wedge. 39. Formally, product of differentials is the wedge product ( search for the article differential form ). 40. The work of �lie Cartan made differential forms one of the basic kinds of tensors used in mathematics.
