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Differential equations in a Banach space
A systematic survey of the theory of linear evolution equations in Banach spaces, reviewed in the period 1968–1982 in Ref. Zh. Matematika, is...
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Heaviside's operational calculus and the attempts to rigorise it
At the end of the 19 th century Oliver Heaviside developed a formal calculus of differential operators in order to solve various physical problems....
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Groups, Fields and Complex Numbers
Ordinary algebra and set, or Boolean, algebra are different. In this chapter we examine the idea that there are a whole range of different...