In the chart below, each gold line connects the year a discovery appears in Indian records to the year the West was credited with it.

The figurePāṇini
The discoveryFormal generative grammar
India · the Westc. 500 BCE · 1950s
Gap~2,400 yrs
Tap or point at any gold line to see its story. These dates come from the "Two Clocks" table in The Lost Lineage.
The Lost Lineage · the book series

Real books.
One story at a time.

The people who built India’s worlds of knowledge, and what happened to their work. Each book is complete on its own, in paperback and hardcover.

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This series began because fifty readers reserved a book that didn’t exist yet. Every one of them is named in the acknowledgements, and will be in every book that follows. Thank you.

The e-books · second editions

Four PDF e-books,
delivered instantly.

Bought here, paid by UPI or bank transfer, and emailed to you straight after payment.

The Lost Lineage cover
History · 64 pages₹399
 Lilavati cover
Puzzles · 26 pages₹149
 Magic Squares cover
Puzzles · 15 pages₹149
 Pingala's Puzzles cover
Puzzles · 22 pages₹249
The Lost Lineage cover
लुप्त परम्परा

The Lost Lineage.

The Archive Editions · No. I · 800 BCE → 1600 CE

Baudhāyana to Jyeṣṭhadeva: twenty-two minds and a chain of mathematics history filed under other names, mapped end to end with the primary sources cited.

PDF e-book39-page book + 3 bonus printsInstant downloadInstant download
  • 22 illustrated files, one for each mathematician
  • The "Two Clocks" table: all 22 discoveries with both dates
  • A closing essay, a glossary, the maths worked step by step, and sources
Free with this book3 bonus prints
The ReaderThe complete e-book, yours to keep
₹399
Lilavati cover
लीलावती

Lilavati.

Problem Papers · No. I · Bhāskara II, c. 1150

India's maths textbook of 1150, written as poetry. Eighteen riddles about bees, pearls, broken bamboo and arrows. Each one gives you the verse, a plain-English version, a hint and space to work it out.

PDF workbook24 pages + bonus posterAnswers at the back
Free with this book1 bonus poster
Try the first riddle, free
A fifth of a swarm of bees settled on a kadamba blossom, a third on a silindhri flower. Three times their difference flew to a kutaja. One bee remained, hovering in the air. Tell me, charming one: how many bees?
₹14918 riddles, every answer worked in full
Magic Squares cover
भद्रगणित

Magic Squares.

Problem Papers · No. II · 587 CE → Khajuraho

The sudoku of the ancient world, from Varāhamihira's perfume recipes to squares carved into temple walls. Twelve puzzles, from easy 3×3 warm-ups to 4×4 temple squares, plus how to make a magic square from your own birthday.

PDF workbook15 pagesAnswers at the back
The Chautīsa Yantra · Khajuraho

Tap any number. Its row and column always add up to the same total.

₹14912 puzzles, each with one answer
Pingala's Puzzles cover
मेरुप्रस्तार

Piṅgala’s Puzzles.

The Archive · File 002 · c. 300 BCE

A poet counting the rhythms of Sanskrit verse ended up with binary numbers and the triangle Europe would later name after Pascal. The story, then four sets of puzzles that let you rediscover it yourself, using nothing harder than doubling and halving.

PDF workbook11 pages + 2 bonus printsAnswers worked in full
Free with this book2 bonus prints
The Mountain of Jewels · tap a row
Each row counts the verse rhythms of a given length, split by how many short syllables they contain.
₹249Workbook, wall chart and practice pad

All three puzzle workbooks

Lilavati, Magic Squares and Piṅgala together, with their bonus prints (63 pages). ₹547 if bought separately.

₹399₹547
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