Folks, I'm reading this paper: User Adaptive QRS Detection Based on One Target Clustering and Correlation Coefficient, and have a question about notation.

In describing peak-detection, they use the following notation: enter image description here

I understand this to mean something like for j=0 to 2: S(i-j) should be greater than S(i-j-1), and S(i+j+1) should be greater than S(i+J), where S is the signal.

But what is that up arrow symbol called? Is it just a logical and? As in this must be true for each of the j?


  • $\begingroup$ hm, I'm starting to follow the references given in the paragraph just above these two equations: What about [7] from the same authors? $\endgroup$ – Marcus Müller May 7 '19 at 11:41
  • 2
    $\begingroup$ I checked with the author and yes, it just means conjunction: logical and. So just as \sum_{j=0}^2{x_j} means x_0 + x_1 + x_2, \land_{j=0}^2{x_j} means x_0 \land x_1 \land x_2 $\endgroup$ – Jabavu Adams May 7 '19 at 15:59
  • $\begingroup$ that would make a great answer! It's totally OK to answer your own questions. $\endgroup$ – Marcus Müller May 7 '19 at 16:01

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