Mathematics supports a quarter of Dutch national income
- First, these jobs create income for the people who work in those jobs. This is called the direct effect.
- Second, the industries where these people work, procure goods and services from other industries which in turn procure from other industries as well, and so on. The impact of these purchases is called the indirect effect.
- Finally, the impact of the household spending resulting from direct and indirect effects of mathematical sciences jobs. This is called the induced effect.

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later a political career as prefect of Isère at Grenoble, where Fourier wrote the first versions of the Théorie analytique de la chaleur, when he was not busy with the construction of the road from Grenoble to Turin or the drainage of marshland at Bourgoin; and finally, his academic role at the very heart of the Parisian scientific community during the years 1820–1830. While relating a variety of aspects which are not all of scientific concern, we shall, of course, dedicate an important space to the theory of heat, Fourier’s major work, as well as to the Fourier series, which are a crucial element of his mathematics.























