Mepụta nsụgharị dị mgbagwoju anya nke ahịrịokwu a Ihe osise nke nkesa exponential, nke a na-akpọ ọrụ njupụta nke ohere (PDF), na-egosi nkesa nke oge (ma ọ bụ anya) n'etiti ihe omume.
N'ezie, ụdị okwu dị mgbagwoju anya nke ahịrịokwu ahụ bụ "A na-akọwapụta eserese nke nkesa exponential, nke a na-akpọ ọrụ njupụta ihe puru omume (PDF), n'ihe gbasara lambda (ihe omume kwa nkeji oge) na x (oge) ".