Abstract
Japanese mathematicians did not contribute directly to martingale theory before 1960, but many later contributions were based on the stochastic calculus that Kiyosi Itô first introduced in 1942. Itô’s collaboration with Henry McKean on the pathwise construction of diffusions attracted wide interest from students in Japan. Subsequent Japanese contributions in the 1960s included adaptations of results on Markov processes to martingales, such as Itô and Watanabe’s multiplicative analog of the Doob–Meyer decomposition, which involved the introduction of local martingales, contributions to stochastic integration for square-integrable martingales and semimartingales, and contributions to the representation of martingales. Japanese contributions after 1970 included Itô’s reformulation of the stochastic calculus in term of stochastic differentials, Itô’s circle operation, the Itô–Tanaka formula, and the Fukushima decomposition.
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Notes
- 1.
The situation at the time was similar in all work on Markov processes, perhaps with the exception of Doob’s work. The same objects were given different names in each theory; for example, stopping times were called Markov times in Markov process theory. Since then, the two theories have gradually mixed together, bringing remarkable progress to each.
- 2.
Cf. Introduction of [5], which was originally Dynkin’s plenary lecture at ICM 1962, Stockholm.
- 3.
Cf. e.g., [38, p. 109].
- 4.
For an AF, it is equivalent that it have zero expectation and that it be a martingale with respect to the natural filtration of the process.
- 5.
The \(f_i\) are Borel functions on \(\textbf{R}^d\) with certain integrability conditions.
- 6.
A standard terminology now is predictable quadratic co-variation of M and N. Meyer [35] introduced another random inner product [M, N], called the quadratic co-variation of M and N, which plays important role in the study of discontinuous semimartingales.
- 7.
- 8.
- 9.
The notion of the compensator for a point process is key in the martingale theoretic approach to point processes. Indeed, it has much to do with semimartingale theory; the discontinuities of a semimartingale define a point process on the real line and, conversely, a point process on a general state space defines a discontinuous semimartingale by a projection of the state space to the real line. Cf. e.g. [9, 22, 25], for the martingale-theoretic approach to point processes and applications.
- 10.
We state it in the one-dimensional case; its multi-dimensional extension is straightforward.
- 11.
Cf. D. W. Stroock’s interesting remark [42, p. 180].
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Watanabe, S. (2022). Martingales in Japan. In: Mazliak, L., Shafer, G. (eds) The Splendors and Miseries of Martingales. Trends in the History of Science. Birkhäuser, Cham. https://doi.org/10.1007/978-3-031-05988-9_9
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