This Indian mathematician, Vijay Sahni, is an atheist who refuses to believe in anything without proof beyond all doubt. He gets imprisoned in the US on a blasphemy charge and, when investigated by a judge, says the proof should be as leak-proof as a Euclidean proposition.

Euclid was an ancient Greek mathematician known for his classic tome, Elements. In this, he proposed a set of axioms that were taken as self-evident. He showed that the entire edifice of geometry could be built on these axioms. Elements influenced several people over the centuries, such as Baruch Spinoza, René Descartes, Albert Einstein and even Abraham Lincoln. It posits an order to the field of geometry and provides the hope that certainty can be found within mathematics.

It is with this notion of certainty that Sahni compares religious rituals and beliefs and finds them coming up short. Mathematics, he maintains, has no need for blind faith such as that which the religious have.

Unfolding events show that even Euclid's geometry may not be the unassailable monolith that it has been thought to be. This shatters Sahni's confidence in absolute certainty and in his Platonism, turning him into an agnostic in everything, even mathematics.

I don't want to reveal what the transformational event was. But for the scientifically literate, it may be easy to guess. The hint is, the year was 1919, and it has to do with non-Euclidean geometry.

Suri and Bal have presented the veritable history of mathematics in such a fashion that even a high school student can understand it. The book provides the best introduction to Euclidean geometry that I have ever come across. It also offers a fascinating glimpse into the mind of Georg Cantor, the man behind set theory. And the discussion of Indian mathematician Bhāskara’s proof of the Pythagoras theorem was an unexpected gem.

A Certain Ambiguity is as much about religion as it is about mathematics. Towards the end of the book, an unexpected question popped into my head: If Euclidean geometry, which has held sway for over 2,000 years, could not be viewed with certainty, then what can one say about the religions that have cropped up in the last two millennia? What can one really rest their faith upon? Can there really be scientific or religious truth that exists outside of human existence?

One mathematician whose work is not covered in the book but who finds a brief mention is Kurt Gödel. The Austrian-born mathematician is supposed to have proved that if you start with any axiom system, you will always find statements that are impossible to prove or disprove. Some statements cannot be decided on one way or the other. Maybe religious and scientific beliefs share the common uneasy feature that they need some faith to take action upon.

A Certain Ambiguity is an extraordinary book that can change one's outlook on life.

Hartosh Singh Bal

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