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uncool

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Posts posted by uncool

  1. I don't see the word "vector', which is the relevant part of the statement I am asking about, in those posts. You are the one who first used it in the context of whether the Lorentz factor is one.

    I'll ask in a slightly different way: what point were you trying to make with the statement "Besides that the Lorentz factor is not a vector."?

  2. Whether 0^0 = 1 is a matter of convention, and depends on the context. For example, if the power is held constant and the base variable (as in the case of Taylor series), the convention is 0^0 = 1. If the base is constant and the power variable (but positive), the convention is 0^0 = 0. 

  3. Infinity is usually not thought of as a number; though there are some cases where you can think of it as a number, those cases treat infinity in different ways, meaning that to answer your question, I'd have to ask what you are trying to do with these "numbers".

  4. From what I've seen lawyers saying, that's not what the bill says. Specifically, the relevant portion of the bill says:

    Assignment grades and scores shall be calculated using ordinary academic standards of substance and relevance, including any legitimate pedagogical concerns, and shall not penalize or reward a student based on the religious content of a student's work.

    It says they can't be penalized based on religious content. Not that they can't be penalized for getting the question wrong, or for not answering the question in the relevant way. 

  5. 1 hour ago, michel123456 said:

    It is also the begin of the hexadecimal system for measuring time. Less than a second are measured in /100. Which is completely bogus.

    sexadecimal. Hexadecimal = base 16; sexadecimal = base 60. Also, time is measured in very mixed base; 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 365.25odd days in a year, and (mostly) decimal from that point on. 

  6. 1 hour ago, Clay Gillespie said:

    It admits itself to easy investigation. This is what we already know, these are more like tenets.

    So is your "theory" a new theory which disagrees with current physics, or is it an explanation of some outcome of current physics?

  7. Gravity does not "always act[...] as an opposing force to inertia", which you'd know if you ever went skydiving. Gravity is a conservative force, and in a universe with just gravity, perpetual motion machines of the second kind are possible. The force that "opposes inertia" (more precisely, that equalizes velocities) is friction

  8. 1 hour ago, Edgard Neuman said:

    Hi,

     

    I read an article about infinities, and as always, I don't get it.
    The writer says : "℘(ℕ)" and "ℕ" are not in bijection..

    but, it seems easy to me to create a bijection :


    You take the binary writing of a number, and you take the rank integer that correspond to each 1

    0 <=> {}

    1 <=> {0}

    2 <=> {1 }
    3 <=>  {0 ; 1 }
    4 <=> { 2 }

    ...
    259 <=> { 0; 1 ; 8  }
    ..

    etc and so on

    you have an integer for each set of integer and vice-versa, isn't it a bijection ?


    So what did I got wrong ?

     

     

    Because for any integer n, the corresponding subset of N will be finite.

    Which integer corresponds to the set of even integers?

  9. "In 1898, Max Planck discovered that action is quantized, and published the result in a paper presented to the Prussian Academy of Sciences in May 1899.[24][25] At the end of the paper, Planck introduced, as a consequence of his discovery, the base units later named in his honor. The Planck units are based on the quantum of action, now usually known as Planck's constant. Planck called the constant b in his paper, though h (or ħ) is now common. Planck underlined the universality of the new unit system [...]"

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