This is the crucial question. The book is copyrighted material. While some authors or publishers have released older editions into open access (e.g., via the National Digital Library of India or NCERT archives), .
The excursion is about the journey—the false starts, the sudden insights, the quiet joy of a proof that clicks. This book, in its humble, typeset-with-gratitude appearance, reminds us that mathematics is not a collection of formulas but a landscape to be explored. an excursion in mathematics pdf