# Book on manifolds from a sheaf-theoretic/locally ringed space PoV

I'm looking for an introductory (or rather, non-advanced) book on manifolds as locally ringed spaces, i.e., from the algebraic geometric viewpoint. Most introductory texts only introduce manifolds from the differentiable viewpoint; I wonder if a text introducing differential manifolds from an algebraic viewpoint exists.

• Locally ringed spaces are not algebraic objects, they are algebraic-geometric objects. Feb 10, 2020 at 20:19
• @MartinBrandenburg That's what I meant, perhaps I was imprecise. I fixed my wording Feb 10, 2020 at 20:45
• Locally ring spaces are neither algebraic nor algebraic-geometric objects (they have nothing to do specifically with algebraic geometry); they are sheaf-theoretic objects. Feb 11, 2020 at 4:31
• There is a serious mismatch between the title and the question asked in the body of the post. The author should clarify whether he is looking specifically for a treatment using locally ringed spaces, as opposed to treatments that largely parallel those found in algebraic geometry books. Nestruev's book is a prime example of the latter, but not the former. Feb 11, 2020 at 4:34
• @DmitriPavlov Thanks for pointing this out. Since I'm looking for an introductory text, apparently this is a field which I know little about. Yes, I mean the former, not the algebraic geometry of complex manifolds covered in, e.g., Griffiths and Harris. Feb 11, 2020 at 16:28

I'm not very familiar with this book (in particular, I don't know how introductory or not it is), but I think

Torsten Wedhorn, Manifolds, Sheaves, and Cohomology. Springer Studium Mathematik—Master. Springer Spektrum, Wiesbaden, 2016. xvi+354 pp. ISBN: 978-3-658-10632-4; 978-3-658-10633-1

• In that book manifolds are defined by charts in the usual way and regarded as formal dual of certain commutative $\mathbb{R}$-algebras. But is a ringed space POV also present in that book? Feb 10, 2020 at 22:57
• This is the ringed space POV, no? (Although now that you mention it I don't think they prove that the $\mathbb R$-algebras they consider are obtained from sections of the structure sheaf of such-and-such ringed space.) Feb 11, 2020 at 0:32
A book $$C^{\infty}$$ Differentiable Spaces by Navarro González and Sancho de Salas develop theory of differentiable spaces by first constructing real spectra for smooth algebras and then glue them in order to obtain general spaces. This is analogical to the development of algebraic geometry (scheme theory) by Grothendieck and his school. The book might be a bit advanced.