Find number of decomposition Z $\oplus$ A to direct sum B $\oplus$ C, where :
1) one of B, C is isomorphic to Z : B $\cong$ Z or C $\cong$ Z
2) Z is infinite and cycle, A is finite and abelian
2026-03-28 10:41:35.1774694495
Find number of decompositions of direct sum
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