Re: Planck's constant U+210E

From: Deborah Goldsmith (goldsmit@apple.com)
Date: Thu Apr 20 2006 - 09:18:37 CST

  • Next message: James Kass: "Re: Planck's constant U+210E"

    On Apr 20, 2006, at 7:20 AM, Andreas Prilop wrote:
    > The symbol for Planck's constant (6.626E-34 Js) is an italic "h".
    > Why is there a special Unicode character U+210E for it?

    To differentiate it for purposes of representing mathematics in plain
    text.
    >
    > The symbol for the elementary charge is an italic "e".
    > But of course there is no special Unicode character for it.

    U+1D452 MATHEMATICAL ITALIC SMALL E
    >
    > The symbol for the speed of light is an italic "c".
    > But of course there is no special Unicode character for it.

    U+1D450 MATHEMATICAL ITALIC SMALL C
    >
    > The symbol for the fine structure constant is an italic "alpha".
    > But of course there is no special Unicode character for it.

    U+1D6FC MATHEMATICAL ITALIC SMALL ALPHA
    >
    > etc. ad inf.
    >
    >
    > So what's this U+210E for?

    The same thing as the others: plain text representation of
    mathematics. Note that there is not a MATHEMATICAL ITALIC SMALL H
    precisely because U+210E exists.

    > IMHO, this character should be listed as deprecated.

    Why?

    Deborah



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