25 citations · 32 across the 6 of their papers we have counts for
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A generalization of Pappus chain theorem
Hiroshi Okumura
We generalize Pappus chain theorem and give an analogue to this theorem.
A note on a problem invoving a square in a curvilinear triangle
Hiroshi Okumura
A problem involving a square in the curvilinear triangle made by two touching congruent circles and their common tangent is generalized.
Haga's theorems in paper folding and related theorems in Wasan geometry Part 2
Hiroshi Okumura
We generalize problems in Wasan geometry which involve no folded figures but are related to Haga's fold in origami. Using the tangent circles appeared in those problems we give a p…
Haga's theorems in paper folding and related theorems in Wasan geometry Part 1
Hiroshi Okumura
Haga's fold in paper folding is generalized. Recent generalization of Haga's theorems and problems in Wasan geometry involving Haga's fold are also generalized.
The Descartes circles theorem and division by zero calculus
Hiroshi Okumura, Saburou Saitoh
From the viewpoint of the division by zero and the division by zero calculus, we will show that in the very beautiful theorem by Descartes on three touching circl…
Wasan geometry with the division by 0
Hiroshi Okumura
Results in Wasan geometry of tangents circles can still be considered in a singular case by the division by 0.