Ultra-hyperbolic pde and F theory

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The discussion explores the potential connection between Fritz John's ultra-hyperbolic partial differential equation and F theory, noting both involve an additional time dimension. The equation presented is u_{tt}+u_{\tau \tau} = u_{xx}+u_{yy}, which raises questions about its implications in the context of F theory. Participants seek literature that discusses this relationship and any introductory resources on F theory, expressing a willingness to engage with comprehensive texts. The conversation highlights an interest in understanding the mathematical frameworks underlying these theories. Overall, the inquiry reflects a desire for deeper insights into the intersection of advanced mathematics and theoretical physics.
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Is there a conncetion between Fritz john's ultra-hyperbolic pde, which is the equation:

u_{tt}+u_{\tau \tau} = u_{xx}+u_{yy}

I mean F theory has another dimension of time, and the above pde has also another time variable with regards to the simple wave pde.

Any literature on this?

Thanks.
 
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Btw, any introductory books in the net regarding F theory?, I don't mind 800-1000 pages books... :-D
 

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