2 8 . ▁In ▁ 1 9 2 9 ▁he ▁became ▁a ▁professor ▁in ▁the ▁Fac ulty ▁of ▁Sciences ▁of ▁the ▁University ▁of ▁Porto . ▁He ▁was ▁one ▁of ▁the ▁found ers ▁of ▁the ▁journal ▁Portugal iae ▁Mathemat ica , ▁in ▁ 1 9 3 7 . ▁ ▁R uy ▁Lu ís ▁G om es ▁was ▁a ▁sympath izer ▁of ▁the ▁Portuguese ▁Commun ist ▁Party , ▁despite ▁never ▁having ▁been ▁a ▁member ▁of ▁the ▁party . ▁In ▁ 1 9 5 1 , ▁he ▁was ▁chosen ▁to ▁be ▁the ▁commun ist ▁president ial ▁candidate , ▁against ▁the ▁candidate ▁of ▁the ▁regime , ▁General ▁Francisco ▁Cra ve iro ▁L op es , ▁and ▁the ▁moder ate ▁opposition ▁candidate , ▁Admir al ▁Manuel ▁Quint ão ▁Me ire les . ▁His ▁candid ature ▁was ▁invalid ated ▁by ▁the ▁Supreme ▁Court ▁of ▁Justice ▁for ▁political ▁reasons , ▁since ▁he ▁was ▁considered ▁a ▁commun ist . ▁He ▁served ▁two ▁prison ▁terms ▁for ▁political ▁activities , ▁once ▁in ▁the ▁early ▁ 1 9 4 0 s ▁and ▁again ▁in ▁ 1 9 5 7 - 5 8 . ▁However , ▁he ▁continued ▁to ▁be ▁a ▁sta unch ▁opposition ist , ▁being ▁forced ▁to ▁ex ile , ▁first ▁in ▁Argentina ▁from ▁ 1 9 5 8 ▁to ▁ 1 9 6 2 , ▁where ▁he ▁taught ▁at ▁the ▁Universidad ▁Nacional ▁del ▁Sur ▁in ▁Bah ía ▁Blan ca , ▁and ▁then ▁in ▁Brazil ▁from ▁ 1 9 6 2 ▁to ▁ 1 9 7 4 , ▁teaching ▁at ▁the ▁Federal ▁University