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What does these symbols "∔" and "∸" in mathematics means? Example of the sentences for ∔: A linear manifold X of the inner product space (X,[·,·]) is a direct summand of X^0 (i.e. X = L∔X^0 for some linear manifold L in X) if and only if it is maximal nondegenerate. Example of the sentences for ∸: Write a formal register machine that computes the function f(x,y)=2x ∸ 2y.

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  • $\begingroup$ New for me too! $\endgroup$ – Brethlosze Jun 5 '17 at 18:21
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    $\begingroup$ It's not very standard notation, so I would hope that those who use the notation define it. $\endgroup$ – Eff Jun 5 '17 at 18:24
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    $\begingroup$ Where have you found these? If possible post a link. $\endgroup$ – lhf Jun 5 '17 at 18:51
  • $\begingroup$ @lhf it from my past exam papers and my professor notes. $\endgroup$ – Haney Zaf Jun 6 '17 at 12:04
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From this document: "the binary operator ∸ is defined by x∸y = x – y if x > y, and 0 otherwise"

From this document: "Here, ∔ denotes the direct sum of two linearly independent linear manifolds, see the next subsection for a more detailed explanation." This is on page 45.

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