As for the PDF version, I recommend checking online platforms like:
Educational Level: University/College (differential geometry is a advanced math topic) differential geometry krishna publication pdf
: Principal curvature, Lines of curvature, and Asymptotic lines. Differential Operators As for the PDF version, I recommend checking
The Krishna Publication PDF has several features that make it a valuable resource for students and researchers: As for the PDF version
: A core textbook that uses the to explain systematic geometric concepts. You can view a limited preview of this title on Google Books. TB Differential Geometry & Tensor Analysis
Strengths
The series provides several well-regarded textbooks on Differential Geometry