one ef the most important innovations in the history ef traditional logic is the avicena's theory ef temporal modalities (.atm). althottgh) the basic concepts and elements ef this theory are fottnded in aristotelian and stoic-lvlegarian !0 gic) but as a independent lo,gical system, are devised on/y fry avicenna and were later developed and completed fry his followers. the atm theory contai...