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• Takashi Hara: From the “real/complex zeta world” to the “p-adic zeta world” Proceedings of the 26th summer school on number theory “Multiple Zeta Values”, 57 – 159 (2019)   Link.
  This is a survey article on the theory of p-adic multiple zeta values and p-adic [multiple] zeta functions. Written in Japanese.
• Takashi Hara: On equivariant Iwasawa theory à la Ritter and Weiss Proceedings of the 22nd summer school on number theory “Non-commutative Iwasawa Theory”, Volume 2, 677 – 826 (2015)   Link.
  We first compare the settings between Ritter-Weiss's equivariant Iwasawa theory and non-commutative Iwasawa theory à la Coates et al. in some details. We then discuss the strategy of Ritter and Weiss towards the proof of the “main conjecture” of their equivariant Iwasawa theory. In appendices, we also deal with Chinburg's conjecture and the lifted root number conjecture à la Gruenberg, Ritter and Weiss, which are deeply related to the works of Ritter and Weiss on equivariant Iwasawa theory. This article is written in Japanese.
• Takashi Hara: A strategy for the proof of the non-commutative Iwasawa main conjecture: the Burns-Kato technique Proceedings of the 22nd summer school on number theory “Non-commutative Iwasawa Theory”, Volume 1, 193 – 339 (2015)   Link.
  This is a survey article on so-called Burns-Kato's technique, which forms the basis of the proof of the non-commutative Iwasawa main conjecture. Written in Japanese.
• Takashi Hara: Concerning actions of 3-manifold groups: from topological and arithmetic viewpoints RIMS Kôkyûroku “Intelligence of Low-dimensional Topology”, 1911, 57 – 75 (2014)   Link
  Survey of my joint work with Takahiro Kitayama on the construction of essential tribranched surfaces utilising geometry on character varieties of higher dimension. It also contains review of the classical Culler-Shalen theory. Written in English.
• Takashi Hara: On the Iwasawa main conjecture for Hilbert modular forms with complex multiplication Proceedings of the 58th Algebra Symposium, 213 – 245 (2013)   Link
  Survey article on the joint work with Tadashi Ochiai in which we discuss the cyclotomic Iwasawa main conjecture for Hilbert cuspforms with complex multiplication. We also deal with the elliptic case as a classical example. Written in Japanese.
• Takashi Hara: On Culler-Shalen theory for 3-manifolds and related topics Proceedings of the 17th Waseda Number Theory Symposium, 60 – 80 (2013)   pdf file.
  After a brief survey of classical Culler-Shalen theory for 3-manifolds, we discuss its extension to character varieties for higher rank representations and its application towards arithmetic topology. Written in Japanese.
• Takashi Hara: On non-commutative Iwasawa main conjectures for totally real number fields RIMS Kôkyûroku Bessatsu, B32, 83 – 104 (2012)   Link
  Survey article on recent development of study on the non-commutative Iwasawa main conjecture for totally real number fields, written in Japanese.
• Kenichi Namikawa, Takashi Hara and Shingo Mori: Special values of L-functions and related topics Proceedings of the 4th Biwako workshop for young mathematicians (2011) pdf.
  Survey article on special values of L-functions. I wrote Part I (theory on pure motives of Grothendieck) and Part IV (Beilinson conjecture and Tamagawa number conjecture). This article is written in Japanese.
• Takashi Hara: On congruences between cyclotomic p-adic zeta functions of Galois representations Proceedings of the 18th summer school on number theory "Introduction to Arthur-Selberg trace fomulae", 403 – 408 (2011)   Link.
  Arguments on congruences between p-adic zeta functions deduced from non-commutative Iwasawa main conjecture, written in Japanese.
• Takashi Hara: On non-commutative Iwasawa theory of totally real number fields RIMS Kôkyûroku Bessatsu, B19, 277 – 299 (2010)   Link.
  Survey article on non-commutative Iwasawa theory and strategy for construction of non-commutative p-adic zeta functions for totally real number fields, written in Japanese.
• Takashi Hara: Weil group Proceedings of the 3rd Biwako workshop for young mathematicians, 429 – 451 (2010)   link.
  Survey article on the Weil group, written in Japanese.
• Takashi Hara: A family of Calabi-Yau varieties and potential automorphy —towards proof of Sato-Tate conjecture— Recent Progressions on R=T —Sato-Tate conjecture and Serre's conjecture— Volume 2, 116 – 195 (2009)   Link.
  Survey article written in Japanese on the thesis A family of Calabi-Yau varieties and potential modularity of Michael Harris, Nick Shepherd-Barron and Richard Taylor, especially concentrated on application of so-called "(l,l')-trick" to Sato-Tate conjecture.
• Takashi Hara: The development of non-commutative Iwasawa theory for totally real number fields Proceedings of the 5th Kinosaki Shinjin Seminar, 120 – 149 (2009)   Link.
  Survey article on recent development of non-commutative Iwasawa theory for totally real number fields, written in Japanese.
• Takashi Hara: On non-commutative Iwasawa theory for totally real number fields pdf version
  A poster for poster presentation in the 16th summer school on number theory, written in Japanese.