Re: Why does EULER CONSTANT not have math property and PLANCK CONSTANT does?

From: Asmus Freytag (
Date: Tue Jul 27 2010 - 17:42:45 CDT

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    On 7/27/2010 3:02 PM, Kenneth Whistler wrote:
    > Karl Williamson asked:
    >> Subject: Why does EULER CONSTANT not have math property and PLANCK CONSTANT does?
    >> They are U+2107 and U+210E respectively.
    > Because U+210E PLANCK CONSTANT is, to quote the standard,
    > "simply a mathematical italic h". It serves as the filler for
    > the gap in the run of mathematical italic letters at U+1D455.
    Correct - they form a set and need to be treated consistently.
    > Other letterlike symbols in that block are not given the
    > Other_Math property, even if they may be used in mathematical
    > expressions. (Note that regular Greek letters are also not
    > given the Other_Math property, even though they obviously also
    > occur in mathematical expressions.)
    For Euler Constant and Weierstrass elliptic function, this doesn't make
    a lot of sense, as these are explicitly mathematical characters, not
    characters that are "also used in mathematical expressions".

    I have put in a formal proposal to add these two (2107 and 2118) to the
    list of characters with the math property.
    > The Math property can be thought of as a hint that a particular
    > symbol is specialized for mathematical usage; it isn't a
    > property that any character that ever occurs in a mathematical
    > expression needs to have. Nor is every character with
    > the Math property only used in mathematical contexts.
    One way to look at this property is as a way to help detection of
    mathematical expressions in running text. Characters that are primarily
    used for mathematical purposes, or prominently used there, should be
    included. Characters that are heavily used in ordinary text, with
    non-mathematical uses should be excluded.


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