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The term split exact sequence is used in two different ways by different people. Some people mean a short exact sequence that right-splits (thus corresponding to a semidirect product) and some people mean a short exact sequence that left-splits (which implies it right-splits, and corresponds to a direct product).
For a direct sum this is clear, as one can inject from or project to the summands. For a left split sequence, the map t × r: B → A × C gives an isomorphism, so B is a direct sum (3.), and thus inverting the isomorphism and composing with the natural injection C → A × C gives an injection C → B splitting r (2.).
is called split if there exists a homomorphism h : C → B such that the composition g ∘ h is the identity map on C. It follows that if these are abelian groups , B is isomorphic to the direct sum of A and C :
An interpunct ·, also known as an interpoint, [1] middle dot, ... to indicate where to split a word and insert a hyphen if the word doesn't fit on the line.
This proof of the multinomial theorem uses the binomial theorem and induction on m.. First, for m = 1, both sides equal x 1 n since there is only one term k 1 = n in the sum. For the induction step, suppose the multinomial theorem holds for m.
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In terms of a new quantity , this expression is a quadratic polynomial with no linear term. By subsequently isolating ( x − h ) 2 {\displaystyle \textstyle (x-h)^{2}} and taking the square root , a quadratic problem can be reduced to a linear problem.
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