Answer the question at the end by quoting:

Friedrich Ludwig Gottlob Frege (; German: ['gotlo:p 'fre:g@]; 8 November 1848 - 26 July 1925) was a German philosopher, logician, and mathematician. He is understood by many to be the father of analytic philosophy, concentrating on the philosophy of language and mathematics. Though largely ignored during his lifetime, Giuseppe Peano (1858-1932) and Bertrand Russell (1872-1970) introduced his work to later generations of logicians and philosophers.
Frege matriculated at the University of Jena in the spring of 1869 as a citizen of the North German Confederation. In the four semesters of his studies he attended approximately twenty courses of lectures, most of them on mathematics and physics. His most important teacher was Ernst Karl Abbe (1840-1905; physicist, mathematician, and inventor). Abbe gave lectures on theory of gravity, galvanism and electrodynamics, complex analysis theory of functions of a complex variable, applications of physics, selected divisions of mechanics, and mechanics of solids. Abbe was more than a teacher to Frege: he was a trusted friend, and, as director of the optical manufacturer Carl Zeiss AG, he was in a position to advance Frege's career. After Frege's graduation, they came into closer correspondence.  His other notable university teachers were Christian Philipp Karl Snell (1806-86; subjects: use of infinitesimal analysis in geometry, analytical geometry of planes, analytical mechanics, optics, physical foundations of mechanics); Hermann Karl Julius Traugott Schaeffer (1824-1900; analytical geometry, applied physics, algebraic analysis, on the telegraph and other electronic machines); and the philosopher Kuno Fischer (1824-1907; Kantian and critical philosophy).  Starting in 1871, Frege continued his studies in Gottingen, the leading university in mathematics in German-speaking territories, where he attended the lectures of Rudolf Friedrich Alfred Clebsch (1833-72; analytical geometry), Ernst Christian Julius Schering (1824-97; function theory), Wilhelm Eduard Weber (1804-91; physical studies, applied physics), Eduard Riecke (1845-1915; theory of electricity), and Hermann Lotze (1817-81; philosophy of religion). Many of the philosophical doctrines of the mature Frege have parallels in Lotze; it has been the subject of scholarly debate whether or not there was a direct influence on Frege's views arising from his attending Lotze's lectures.  In 1873, Frege attained his doctorate under Ernst Christian Julius Schering, with a dissertation under the title of "Ueber eine geometrische Darstellung der imaginaren Gebilde in der Ebene" ("On a Geometrical Representation of Imaginary Forms in a Plane"), in which he aimed to solve such fundamental problems in geometry as the mathematical interpretation of projective geometry's infinitely distant (imaginary) points.  Frege married Margarete Katharina Sophia Anna Lieseberg (15 February 1856 - 25 June 1904) on 14 March 1887.

Did they have any children?





Answer the question at the end by quoting:

Mraz was born and raised in Mechanicsville, Virginia. He is of Czech and Slovak descent through his grandfather, who moved to the United States from Austria-Hungary in 1915. His surname is Czech for "frost". (Czech: mraz)
On July 26, 2005, Mraz released his second major label album, Mr. A-Z, produced by Steve Lillywhite for Atlantic Records. The album's lead single, "Wordplay", was produced by Kevin Kadish, and entered the Billboard 200 at number 5. The album earned a Grammy Award nomination for Best Engineered Album, Non-Classical, while Lillywhite received a nomination for Producer of the Year.  Mraz began a long-running tour in support of Mr. A-Z at the San Diego Music Awards on September 12, 2005. The tour featured several opening acts, including Bushwalla and Tristan Prettyman, with whom he had written the duet "Shy That Way" in 2002. Mraz opened for Alanis Morissette during her 2005 Jagged Little Pill Acoustic tour, and for the Rolling Stones on five dates during their 2005-06 world tour. In March 2006, he performed in Singapore as part of the annual Mosaic Music Festival. That May, he toured mostly small venues and music festivals in the U.S., along with a few shows in the United Kingdom and Ireland where he supported James Blunt  The tour included a May 6, 2006 acoustic show with P.O.D., Better Than Ezra, Live, and The Presidents of the United States of America. Mraz was featured as a headlining guest of St. Louis's annual Fair St. Louis and performed a free concert at the base of the Gateway Arch on July 1, 2006. During this time, Mraz was also the opening act at several dates for Rob Thomas' Something to Be Tour.  In 2005, Mraz was one of many singers featured in the fall advertisement campaign for The Gap entitled "Favorites", singing a cover of Bob Marley's "One Love". 2006 saw the release of Selections for Friends, the live, online-only album recorded during the Songs for Friends Tour. In 2007, "The Beauty in Ugly", an earlier track penned by Mraz originally titled "Plain Jane", was rewritten for the ABC television show Ugly Betty. The song was featured as a part of ABC's "Be Ugly in '07" campaign. Also that year, on American Idol, contestant Chris Richardson performed a cover of Mraz's "Geek in the Pink".

What was Mraz doing in 2008?
2006 saw the release of Selections for Friends, the live, online-only album recorded during the Songs for Friends Tour. In 2007,