With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Spider-Man appears in a superhero shared universe.
text_B: In mathematics , the Schwarz triangle function was introduced by H. A. Schwarz as the inverse function of the conformal mapping uniformizing a Schwarz triangle , i.e. a geodesic triangle in the upper half plane with angles which are either 0 or of the form over a positive integer greater than one .. mathematics. mathematics. H. A. Schwarz. H. A. Schwarz. conformal mapping. conformal mapping. Schwarz triangle. Schwarz triangle. geodesic triangle. hyperbolic triangle. upper half plane. upper half plane. Applying successive hyperbolic reflections in its sides , such a triangle generates a tessellation of the upper half plane -LRB- or the unit disk after composition with the Cayley transform -RRB- .. upper half plane. upper half plane. tessellation. tessellation. Cayley transform. Cayley transform. The conformal mapping of the upper half plane onto the interior of the geodesic triangle generalizes the Schwarz -- Christoffel transformation .. conformal mapping. conformal mapping. geodesic triangle. hyperbolic triangle. upper half plane. upper half plane. Through the theory of the Schwarzian derivative , it can be expressed as the quotient of two solutions of a hypergeometric differential equation with real coefficients and singular points at 0 , 1 and ∞ .. Schwarzian derivative. Schwarzian derivative. hypergeometric differential equation. hypergeometric differential equation. By the Schwarz reflection principle , the discrete group generated by hyperbolic reflections in the sides of the triangle induces an action on the two dimensional space of solutions .. Schwarz reflection principle. Schwarz reflection principle. On the orientation-preserving normal subgroup , this two dimensional representation corresponds to the monodromy of the ordinary differential equation and induces a group of Mobius transformations on quotients of solutions .. monodromy. monodromy. ordinary differential equation. ordinary differential equation. Since the triangle function is the inverse function of such a quotient , it is therefore an automorphic function for this discrete group of Mobius transformations .. automorphic function. automorphic function. This is a special case of a general method of Henri Poincare that associates automorphic forms with ordinary differential equations with regular singular points .. Henri Poincare. Henri Poincare. In the special case of ideal triangles , where all the angles are zero , the tessellation corresponds to the Farey tessellation and the triangle function yields the modular lambda function .. tessellation. tessellation. Farey tessellation. Farey series. modular lambda function. modular lambda function
not_related.