Like John Allen Paulos, I am often asked why mathematics is worth studying. In his book *A Mathematician Reads the Newspaper* (Basic Books, 1995), Paulos gives an excellent answer:

βAs a mathematician, Iβm often challenged to come up with compelling reasons to study mathematics. If the questioner is serious, I reply that there are three reasons or, more accurately, three broad classes of reasons to study mathematics. Only the first and most basic class is practical. It pertains to job skills and the needs of science and technology. The second concerns the understandings that are essential to an informed and effective citizenry. The last class of reasons involves considerations of curiosity, beauty, playfulness, perhaps even transcendence and wisdom.β

The second and third answers are reflected in the words inscribed on the door of Platoβs Academy: βLet no one ignorant of geometry enterβ (αΌΞ³Ξ΅ΟΞΌΞΟΟΞ·ΟΞΏΟ ΞΌΞ·Ξ΄Ξ΅α½ΆΟ Ξ΅αΌ°ΟΞ―ΟΟ):

The *first* answer relates to the critical importance of mathematics in several fields of human endeavour, including science, engineering, medicine, and finance. For example:

*The spread of an infectious disease can be predicted by a set of three differential equations, relating three variables: S, I, and R (left). Real-world disease outbreaks show a similar pattern (right).*
Many people list this as the only reason for studying mathematics, but it only applies to a minority of students – those keeping open the option of entering those fields. The *second* answer relates to the importance of mathematics in decision-making by ordinary citizens, and this applies to everybody. Some of those decisions by citizens require quantitative thinking. For example, which groceries are the best value for money? If two studies on 20 people report that a certain vegetable causes cancer, and one study on 1,000 people report that it doesnβt, is the vegetable safe? More subtly, training in mathematics helps in thinking clearly even about non-quantitative issues. Plato seemed to think that mathematics was *essential* training, and I would agree. Bertrand Russell put it this way: βOne of the chief ends served by mathematics, when rightly taught, is to awaken the learner’s belief in reason, his confidence in the truth of what has been demonstrated, and in the value of demonstration.β

*What is the best value for money – the melons at $5 each, the grapes at $4 per kg, or the blueberries at $3 per punnet?*
*This classic book has applications to more than mathematics.*
The *third* answer relates to a famous remark of Debussy – βLa musique est une mathΓ©matique mystΓ©rieuse dont les Γ©lΓ©ments participent de lβinfiniβ (βMusic is a mysterious mathematics whose elements partake of the Infiniteβ). It works the other way around too. Mathematics is a mysterious and beautiful music that puts one in touch with the Infinite. As Plato would have said, mathematics reminds us that more things exist than just the finite and physical. This particularly applies to those parts of mathematics which relate to infinity, such as the number Ο, or the Mandelbrot set:

π = 3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235 4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837 2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035 2619311881 7101000313 7838752886 5875332083 8142061717 7669147303 5982534904 2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787 6611195909 2164201989 …

*Some of the (infinitely many) digits of Ο.*
Rudy Ruckerβs little book *The Fourth Dimension and How to Get There* is also a great mind-stretcher. And, of course, having oneβs mind stretched like that is a lot of fun.

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