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    $\begingroup$ Re: TensorRank[], how very odd. "Introduced in 2012 (9.0)", and yet it's been around since the first version, and at one point "replaced by ArrayDepth". $\endgroup$ Commented May 21, 2015 at 16:48
  • $\begingroup$ @Guess The poor developers are run every which direction. Rube Goldberg would love the present state of affairs. :o) $\endgroup$ Commented May 21, 2015 at 16:50
  • $\begingroup$ I am slightly frightened whenever I get into a situation where it turns out that I know even slightly more than the supposed experts… :o $\endgroup$ Commented May 21, 2015 at 16:56
  • $\begingroup$ @Guess I wouldn't jump to that conclusion in this case; I imagine the developers are well aware that this was a v1 function but someone probably told them to pretend that it was a new function in v9 as that has better publicity than "oops, we deprecated that but now see value in reintroducing it and applying it to this shiny new tensor stuff we'd like you to upgrade for" ;-) $\endgroup$ Commented May 21, 2015 at 16:59
  • $\begingroup$ Good point; but then, I spent some amount of time bitching about why they renamed TensorRank[], so reading that "new" bit gave mixed emotions. :) Oh well, glad that it's "back". $\endgroup$ Commented May 21, 2015 at 17:06