Cross-sectional studies are also known as transversal and prevalence study. It is a form class of research methods that is all about population and the different case control studies that provide data on all the population that is under study.
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euclidist
A Geologist needs to know a lot about geometry.
For social studies i know the answer is called a boundary
He often used paradoxes in his works. In 1936, he began to explore the studies of mathematics and often used them in his works. Escher produced works that had various viewpoints and intepretations.
Plato believed that studying mathematics strengthened mental abilities, serving as a necessary prelude to the demands of philosophical studies. For Plato, a special part of the mind, the nous, is involved in understanding mathematical truths. These truths pertain to things outside space and time. In this respect, mathematical truths are similar to theological and metaphysical truths. Therefore mathematics prepares the mind for theology and metaphysics.