Advanced Molten-Salt Reactor Using High-Temperature Tech

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On F can be described in the language of smooth groupoids [39], or alternatively by introducing a “crossed product” algebra which incorporates the groupoid convolution. , f E CF(Dom&)}. 18) Any two such elements are composable, since the support of f ( g 0 &) is a compact subset of Dom n &-l(Dom C Dom($G). This construction is called the smash product in the Hopf algebra books: if H is a Hopf algebra and A is a left Hopf H-module algebra, the smash product is the algebra A # H which is defined as the vector space A @ H with the product rule & F) ( a @ h)(b@ k) := C a ( h : l.

To make sure that it is a Hopf algebra, it suffices t o show that it is graded and connected, whereby the antipode comes for free. 6): y(rlr2)= T ( r l )+ Y(r2) and T(y) + T(r/y) = Y(r) whenever y is a divergent proper subgraph of r. ) := I ( r )- V ( r ) 1, if I? has I ( r ) internal lines and V ( r ) vertices. ) = 0, then r would be a tree graph, which is never 1PI; thus ker! consists of scalars only, so Ha is connected. 20) 0575r As it stands, the Hopf algebra Ha corresponds t o a formal manipulation of graphs.

If in any tree T, the longest path from the root to a leaf contains k edges, then the coproduct AT is a sum of at least k 1 terms. In the applications to renormalization, T represents a possibly divergent integration with k nested subdivergences, while the primitive tree t l corresponds to an integration without subdivergences. A primitive algebraic combination of trees represents a collection of integrations where some of these divergences may cancel. For that reason alone, it would be desirable to describe all the primitive elements of H R and then, as far as possible, to rebuild H R from its primitives.

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Advanced Molten-Salt Reactor Using High-Temperature Tech
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