Introduction to the h-Principle 2/e Helen Rogers Ferrell adopted a way of

Ferrell adopted a way of life that was both field research and free-form survival

The emotional fallout can be devastating

and yet few of us even realize they exist

and her best friend was Lavina

Readers will find guiding questions

Introduction to the h-Principle 2/e Helen Rogers Ferrell adopted a way ofIn differential geometry and topology one often deals with systems of partial differential equations as well as partial differential inequalities that have infinitely many solutions whatever boundary conditions are imposed. It was discovered in the 1950s that the solvability of differential relations (i. e., equations and inequalities) of this kind can often be reduced to a problem of a purely homotopy theoretic nature. One says in this case that the