Geodesic
On subrings of amalgamated free products of rings
Colloquium Mathematicum, Tome 79 (1999) no. 2, pp. 241-248
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The aim of this paper is to develop the homological machinery needed to study amalgams of subrings. We follow Cohn [1] and describe an amalgam of subrings in terms of reduced iterated tensor products of the rings forming the amalgam and prove a result on embeddability of amalgamated free products. Finally we characterise the commutative perfect amalgamation bases. 
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James Renshaw. On subrings of amalgamated free products of rings. Colloquium Mathematicum, Tome 79 (1999) no. 2, pp. 241-248. doi: 10.4064/cm-79-2-241-248

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