▁F atra ▁( L esser ▁F atra ), ▁in ▁the ▁Ž il ina ▁and ▁T ren č ín ▁regions ▁ ▁Both ▁ranges ▁belong ▁to ▁the ▁F atra - T atra ▁Area , ▁a ▁part ▁of ▁the ▁Inner ▁Western ▁Car path ians . ▁ ▁In ▁Islam , ▁the ▁term ▁fat ra ▁refers ▁to ▁the ▁three - year ▁period ▁( 6 1 0 – 6 1 3 ) ▁between ▁the ▁first ▁revel ation ▁of ▁Muhammad ▁and ▁the ▁start ▁of ▁his ▁min istry . <0x0A> </s> ▁Alexander ▁Raz g ul in ▁() ▁( born ▁ 1 9 6 3 ) ▁is ▁a ▁Russian ▁math ematic ian , ▁Professor , ▁Dr . Sc ., ▁a ▁professor ▁at ▁the ▁Fac ulty ▁of ▁Computer ▁Science ▁at ▁the ▁Moscow ▁State ▁University . ▁ ▁He ▁def ended ▁the ▁th esis ▁« St able ▁method ▁for ▁solving ▁linear ▁equations ▁with ▁non comp act ▁operators ▁and ▁its ▁applications ▁to ▁control ▁and ▁observation ▁problems » ▁for ▁the ▁degree ▁of ▁Doctor ▁of ▁Phys ical ▁and ▁Mathemat ical ▁Sciences ▁( 2 0 0 9 ). ▁ ▁Author ▁of ▁ 2 4 ▁books ▁and ▁more ▁than ▁ 1 0 0 ▁scientific ▁articles . ▁ ▁References ▁ ▁Bibli ography ▁ ▁External ▁links ▁ ▁MS U ▁C MC ▁ ▁Scient ific ▁works ▁of ▁Alexander ▁Raz g ul in ▁ ▁Scient ific ▁works ▁of ▁Alexander ▁Raz g ul in ▁ ▁Category : Russ ian ▁computer ▁scient ists ▁Category : Russ ian ▁mathemat icians ▁Category : L iving ▁people ▁Category : M osc ow ▁State ▁University ▁fac ulty ▁Category : 1