A van Kampen theorem for separable algebras
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- by Andy R. Magid PDF
- Proc. Amer. Math. Soc. 39 (1973), 483-488 Request permission
Abstract:
If the commutative ring $S$ is the fibre product of ${R_1}$ and ${R_2}$ over $R$, and if ${R_2}$ maps onto $R$, then the fundamental group of $S$ is the profinite free product of the fundamental groups of ${R_1}$ and ${R_2}$ with the fundamental group of $R$ amalgamated.References
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Additional Information
- © Copyright 1973 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 39 (1973), 483-488
- MSC: Primary 13B05
- DOI: https://doi.org/10.1090/S0002-9939-1973-0313237-0
- MathSciNet review: 0313237