Is there a conncetion between Fritz john's ultra-hyperbolic pde, which is the equation:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] u_{tt}+u_{\tau \tau} = u_{xx}+u_{yy} [/tex]

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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# Ultra-hyperbolic pde and F theory

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