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G. ‘tHooft (2015) G. ‘tHooft Asks a Question about General Relativity on ResearchGate, Questions and Answers, October.
https://www.researchgate.net/post/In_GR_can_we_always_choose_the_local_speed_of_light_to_be
_everywhere_smaller_that_the_coordinate_speed_of_light_Can_this_be_used_in_a_theory

has been cited by the following article:

• TITLE: The Counterintuitive Increase of Information Due to Extra Spacetime Dimensions of a Black Hole and Dvoretzky’s Theorem

  AUTHORS: Mohamed S. El Naschie

  KEYWORDS: Higher Dimensional Black Holes, Dvoretzky’s Theorem, Information Paradox, E-Infinity Theory, Counterintuitive Geometry, Bekenstein Limit, Hawking Radiation, ‘tHooft-Susskind Black Holes

  JOURNAL NAME: Natural Science, Vol.7 No.10, October 28, 2015

  ABSTRACT: As per Hawking and Bekenstein’s work on black holes, information resides on the surface and there is a limit on it amounting to a bit for every Planck area. It would seem therefore that extra dimensions would logically lead to a hyper-surface for a black hole and consequently a reduction of the corresponding information density due to the dilution effect of these additional dimensions. The present paper argues that the counterintuitive opposite of the above is what should be expected. This surprising result is a consequence of a well known theorem on measure concentration due to I. Dvoretzky.