▁C ay ley , ▁Felix ▁Klein , ▁or ▁William ▁King don ▁Cl iff ord , ▁who ▁contributed ▁to ▁group ▁theory , ▁invariant ▁theory ▁and ▁project ive ▁geometry , ▁form ulating ▁concepts ▁such ▁as ▁the ▁C ay ley – K lein ▁metric ▁or ▁the ▁hyper bol oid ▁model ▁in ▁which ▁the ▁interval ▁ ▁and ▁its ▁in var iance ▁was ▁defined ▁in ▁terms ▁of ▁hyper bol ic ▁geometry . ▁Using ▁similar ▁methods , ▁M ink owski ▁succeeded ▁in ▁form ulating ▁a ▁geomet rical ▁interpretation ▁of ▁the ▁Lor ent z ▁transformation . ▁He ▁completed , ▁for ▁example , ▁the ▁concept ▁of ▁four ▁vectors ; ▁he ▁created ▁the ▁M ink owski ▁diagram ▁for ▁the ▁dep iction ▁of ▁space - time ; ▁he ▁was ▁the ▁first ▁to ▁use ▁expressions ▁like ▁world ▁line , ▁proper ▁time , ▁Lor ent z ▁in var iance / cov ar iance , ▁etc .; ▁and ▁most ▁not ably ▁he ▁presented ▁a ▁four - dimensional ▁form ulation ▁of ▁elect rod ynam ics . ▁Similar ▁to ▁Po inc ar é ▁he ▁tried ▁to ▁form ulate ▁a ▁Lor ent z - in variant ▁law ▁of ▁gravity , ▁but ▁that ▁work ▁was ▁subsequently ▁su pers eded ▁by ▁Ein stein ' s ▁elabor ations ▁on ▁grav itation . ▁ ▁In ▁ 1 9 0 7 ▁M ink owski ▁named ▁four ▁prede cess ors ▁who ▁contributed ▁to ▁the ▁form ulation ▁of ▁the ▁relativ ity ▁principle : ▁Lor ent z , ▁Ein stein , ▁Po inc ar é ▁and ▁Plan ck . ▁And ▁in ▁his ▁famous ▁lecture ▁Space ▁and ▁Time