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Circled minus sign

  1. Jul 25, 2014 #1
    This should be really easy, but I can't seem to find the answer. What does the symbol ##\ominus## mean in the context of Hilbert spaces? As in "##H \ominus A##" where H is a Hilbert space and A is presumably a subspace or subset of H. I'm guessing it's like the inverse of a direct sum, ##\oplus##? As in, if ##H = A \oplus B##, then ##H \ominus A = B##. Is that correct?
     
  2. jcsd
  3. Jul 25, 2014 #2
    Did some more searching and found the answer here. One of the answers there says:

     
  4. Jul 26, 2014 #3

    HallsofIvy

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    Thanks for posting that. So "[itex]A\oplus B[/itex]" is the "orthogonal complement" of B in A.
     
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