The tt-successive associated Stirling numbers, tt-Fibonacci--Stirling numbers, and unimodality
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Ali Akbar AREFIJAMAAL, Fahimeh Arabyani NEYSHABURI
Javad ALIDOUSTI, Reza KHOSHSIAR GHAZIANI, Ali BAYATI ESHKAFTAKI
HACENE BELBACHIR, ASSIA-FETTOUMA TEBTOUB
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Schanuel's lemma, the snake lemma, and product and direct sum in HvHv-modules