chain complex
in homological algebra, a structure consisting of a sequence of modules and a sequence of homomorphisms between consecutive modules such that the image of each homomorphism is included in the kernel of the next
en-GB/ˈt͡ʃeɪn ˈkɒmplɛks/
en-US/ˈt͡ʃeɪn ˈkɑmplɛks/