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Georg Ferdinand Ludwig Philipp Cantor ( KAN-tor; German: ['geoRk 'feRdinant 'lu:tvIc 'fIlIp 'kantoR]; March 3 [O.S. February 19] 1845 - January 6, 1918) was a German mathematician. He invented set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers.
After Cantor's 1884 hospitalization, there is no record that he was in any sanatorium again until 1899. Soon after that second hospitalization, Cantor's youngest son Rudolph died suddenly on December 16 (Cantor was delivering a lecture on his views on Baconian theory and William Shakespeare), and this tragedy drained Cantor of much of his passion for mathematics. Cantor was again hospitalized in 1903. One year later, he was outraged and agitated by a paper presented by Julius Konig at the Third International Congress of Mathematicians. The paper attempted to prove that the basic tenets of transfinite set theory were false. Since the paper had been read in front of his daughters and colleagues, Cantor perceived himself as having been publicly humiliated. Although Ernst Zermelo demonstrated less than a day later that Konig's proof had failed, Cantor remained shaken, and momentarily questioning God. Cantor suffered from chronic depression for the rest of his life, for which he was excused from teaching on several occasions and repeatedly confined in various sanatoria. The events of 1904 preceded a series of hospitalizations at intervals of two or three years. He did not abandon mathematics completely, however, lecturing on the paradoxes of set theory (Burali-Forti paradox, Cantor's paradox, and Russell's paradox) to a meeting of the Deutsche Mathematiker-Vereinigung in 1903, and attending the International Congress of Mathematicians at Heidelberg in 1904. In 1911, Cantor was one of the distinguished foreign scholars invited to attend the 500th anniversary of the founding of the University of St. Andrews in Scotland. Cantor attended, hoping to meet Bertrand Russell, whose newly published Principia Mathematica repeatedly cited Cantor's work, but this did not come about. The following year, St. Andrews awarded Cantor an honorary doctorate, but illness precluded his receiving the degree in person. Cantor retired in 1913, living in poverty and suffering from malnourishment during World War I. The public celebration of his 70th birthday was canceled because of the war. In June 1917, he entered a sanatorium for the last time and continually wrote to his wife asking to be allowed to go home. Georg Cantor had a fatal heart attack on January 6, 1918, in the sanatorium where he had spent the last year of his life.
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what did he do in his later years

Answer:
In 1911, Cantor was one of the distinguished foreign scholars invited to attend the 500th anniversary of the founding of the University of St. Andrews in Scotland.

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Nurmi was born in Turku, Finland, to carpenter Johan Fredrik Nurmi and his wife Matilda Wilhelmiina Laine. Nurmi's siblings, Siiri, Saara, Martti and Lahja, were born in 1898, 1902, 1905 and 1908, respectively. In 1903, the Nurmi family moved from Raunistula into a 40-square-meter apartment in central Turku, where Paavo Nurmi would live until 1932. The young Nurmi and his friends were inspired by the English long-distance runner Alfred Shrubb.
Less than three days before the 10,000 m, a special commission of the IAAF, consisting of the same seven members that had suspended Nurmi, rejected the Finn's entries and barred him from competing in Los Angeles. Sigfrid Edstrom, president of the IAAF and chairman of its executive council, stated that the full congress of the IAAF, which was scheduled to start the next day, could not reinstate Nurmi for the Olympics but merely review the phases and political angles related to the case. The AP called this "one of the slickest political maneuvers in international athletic history", and wrote that the Games would now be "like Hamlet without the celebrated Dane in the cast." Thousands protested against the action in Helsinki. Details of the case were not released to the press, but the evidence against Nurmi was believed be the sworn statements from German race promoters that Nurmi had received $250-500 per race when running in Germany in autumn 1931. The statements were produced by Karl Ritter von Halt after Edstrom had sent him increasingly threatening letters, warning that if evidence against Nurmi is not provided, he "will unfortunately have to take stringent action against the German Athletics Association." On the eve of the marathon, all the entrants of the race except for the Finns, whose positions were known, filed a petition asking Nurmi's entry to be accepted. Edstrom's right-hand man Bo Ekelund, secretary general of the IAAF and head of the Swedish Athletics Federation, approached the Finnish officials and stated that he might be able to arrange for Nurmi to participate in the marathon outside the competition. However, Finland maintained that as long as the athlete is not declared a professional, he must have the right to participate in the race officially. Although he had been diagnosed with a pulled Achilles tendon two weeks earlier, Nurmi stated he would have won the event by five minutes. The congress concluded without Nurmi being declared a professional, but the council's authority to disbar an athlete was upheld on a 13-12 vote. However, due to the close vote, the matter was postponed until the 1934 meet in Stockholm. Finns charged that the Swedish officials had used devious tricks in their campaign against Nurmi's amateur status, and ceased all athletic relations with Sweden. A year earlier, controversies on the track and in the press had led Finland to withdraw from the Finland-Sweden athletics international. After Nurmi's suspension, Finland did not agree to return to the event until 1939. Nurmi refused to turn professional, and continued running as amateur in Finland. In 1933, he ran his first 1500 m in three years and won the national title with his best time since 1926. At the IAAF meet in August 1934, Finland launched two proposals that lost. The council then brought forward its resolution empowering it to suspend athletes that it finds in violation of the IAAF amateur code. With a 12-5 vote, with many not voting, Nurmi's suspension from international amateur athletics became definite. Less than three weeks later, Nurmi retired from running with a 10,000 m victory in Viipuri on 16 September 1934. Nurmi remained undefeated in the distance throughout his 14-year top-level career. In cross country running, his win streak lasted 19 years.
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Did he win any titles?

Answer:
In 1933, he ran his first 1500 m in three years and won the national title with his best time since 1926.