Vol. 13, No. 1 (2002)

**Hideo Takemoto and Atsushi Uchiyama**: A remark of the numericalranges of operators on Hilbert spaces, 1-

**Fumihiko Kimura**: Some spectral properties of analytic elementary operators, 9-

**Yoshinori Matsuura, Shinnosuke Oharu and Duncan Tebbs**: On a class of reaction-diffusion systems describing bone remodelling phenomena, 17-

**Fumio Narita**: Weyl normal connections of Weyl submanifolds, 33-

**Takashi Yoshino**: The structure of norm-achieved Toeplitz and Hankel operators, 43-

**Tatsuo Konno**: Unit tangent bundle over two-dimensional real projective space, 57-

**Ilham Eli and Niro Yanagihara**: Transcendental entire solution of some q-difference equation, 67-

**Nobuhiro Innami**: Geometry of geodesics for convex billiards and circular billiards, 73-