Calculus Has Two Fathers in the Textbooks. It Had a Grandfather in Kerala

Ask who invented calculus and you’ll get one of two names, or both: Isaac Newton and Gottfried Wilhelm Leibniz, working independently in the late 1600s, locked in one of the most famous priority disputes in the history of science.

Now travel back another two and a half centuries, to a stretch of the Malabar coast in what is now Kerala, in southwest India. There, around the year 1400, a mathematician named Madhava of Sangamagrama was writing down results that would not appear in Europe until Newton and Leibniz were alive — and in some cases, exactly the results that would later carry their names.

This is a story that’s easy to tell badly, in either direction. So let’s tell it carefully.

What Madhava actually did

Madhava’s great insight was into infinite series — the idea that you can capture a number or a function as an endless sum of simpler terms, getting closer and closer to the true value the more terms you add.

He found such a series for π. You may have seen it: π/4 = 1 − 1/3 + 1/5 − 1/7 + … , a beautiful, simple pattern that creeps toward pi. In the West it’s called the Gregory–Leibniz series, after the 17th-century Europeans who discovered it. Madhava had it around 1400 — which is why historians now often call it the Madhava–Leibniz series. He went further, adding clever correction terms to make it converge faster, and used his methods to compute π accurately to roughly eleven decimal places.

He didn’t stop at π. Madhava found infinite series for the sine and cosine functions too — the same expansions a modern student meets in a calculus course, arrived at centuries early, on palm-leaf manuscripts, on the other side of the world.

A school, not a lone genius

What makes this more than a fluke is that Madhava founded a whole tradition. The Kerala school carried his work forward for generations. Around 1500, Nilakantha Somayaji extended the astronomy and mathematics. Around 1530, Jyeshthadeva wrote the Yuktibhasa, a text remarkable for actually laying out the reasoning — the derivations behind the results — which is why some historians describe it as containing ideas of analysis, even an early flavour of the calculus, in worked-out form.

For a long time none of this was known in the West at all. It wasn’t until 1834 that a British official named C. M. Whish published a paper pointing out, to a skeptical European audience, that Indian mathematicians had found these series long before Newton’s generation.

The claim to make — and the one not to

Here is where honesty matters, because this topic attracts overstatement.

It is true that the Kerala school discovered specific, central results of what we now call calculus — infinite series, and some of the limiting and summation reasoning that underpins them — two to three centuries before Europe. That is not nationalist myth-making; it’s accepted history of mathematics.

It is not accurate to say they “invented calculus” whole. Calculus as Newton and Leibniz built it is a vast, unified machine: a general framework linking differentiation and integration, a systematic method that applies to almost any function. The Kerala mathematicians found some of its most important ingredients and results, brilliantly — but they didn’t assemble the whole general system. Both things are true at once, and you don’t have to inflate the first to be amazed by it.

Did the ideas travel? Nobody can prove it

There’s one more tantalising thread, and it’s important to handle it truthfully.

In the 1500s and 1600s, Jesuit missionaries were active on the Malabar coast — the very region where the Kerala school worked. Some scholars have wondered aloud whether Kerala’s mathematical results could have filtered back to Europe through these channels, seeding ideas that later flowered in Newton’s and Leibniz’s era.

It’s a genuinely fascinating possibility. It is also, at present, unproven. There is no documentary chain showing that any Kerala manuscript reached and influenced a European mathematician. Priority — being first — is established. Influence is speculation. A serious account has to keep those two things apart, however much the coincidence of time and place invites a bolder story.

Why it matters anyway

Even stripped of the romance of a secret transmission, the plain facts are extraordinary. On a coast better known to Europe for its pepper, a lineage of Indian mathematicians spent two centuries doing work of a depth that the rest of the world would not reach until the age of Newton — and then, because those palm-leaf texts stayed local and untranslated, the world simply didn’t know.

Calculus has two fathers in the textbooks. It’s long past time the grandfather in Kerala got his name in the family record too — not as a myth, but as exactly what he was.