# Horseshoe lemma

In homological algebra, the **horseshoe lemma**, also called the **simultaneous resolution theorem**, is a statement relating resolutions of two objects and to resolutions of
extensions of by . It says that if an object is an extension of by , then a resolution of can be built up inductively with the *n*th item in the resolution equal to the coproduct of the *n*th items in the resolutions of and . The name of the lemma comes from the shape of the diagram illustrating the lemma's hypothesis.

## Formal statement

Let be an abelian category with enough projectives. If

is a diagram in such that the column is exact and the rows are projective resolutions of and respectively, then it can be completed to a commutative diagram

where all columns are exact, the middle row is a projective resolution
of , and for all *n*. If is an
abelian category with enough injectives, the dual statement also holds.

The lemma can be proved inductively. At each stage of the induction, the properties of projective objects are used to define maps in a projective resolution of . Then the snake lemma is invoked to show that the simultaneous resolution constructed so far has exact rows.

## See also

## References

- Henri Cartan and Samuel Eilenberg
*Homological algebra*, Princeton University Press, 1956. - M. Scott Osborne,
*Basic homological algebra*, Springer-Verlag, 2000.

*This article incorporates material from horseshoe lemma on PlanetMath, which is licensed under the Creative Commons Attribution/Share-Alike License.*