• 6 Posts
  • 280 Comments
Joined 1 year ago
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Cake day: June 15th, 2023

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  • The short version is: we use some weird abstractions (i.e., ways of representing complex things) to do math and make sense of things.

    The longer version:

    Electromagnetic signals are how we transmit data wirelessly. Everything from radio, to wifi, to xrays, to visible light are all made up of electromagnetic signals.

    Electromagnetic waves are made up of two components: the electrical part, and the magnetic part. We model them mathematically by multiplying one part (the magnetic part, I think) by the constant i, which is defined as sqrt(-1). These are called “complex numbers”, which means there is a “real” part and a “complex” (or “imaginary”) part. They are often modeled as the diagram OP posted, in that they operate at “right angles” to each other, and this makes a lot of the math make sense. In reality, the way the waves propegate through the air doesn’t look like that exactly, but it’s how we do the math.

    It’s a bit like reading a description of a place, rather than seeing a photograph. Both can give you a mental image that approximates the real thing, but the description is more “abstract” in that the words themselves (i.e., squiggles on a page) don’t resemble the real thing.






  • Ah, that would definitely make a difference. A debit transaction uses some form of “password” like a PIN or the data embedded in a card chip. A credit transaction technically only relies on easily available data and sometimes a signature, much more common for fraud (it’s pretty easy to read and replicate the data from a magnetic strip–one of my classmates did a project to read magnetic strips, and they had to stop letting people swipe their own cards on it because it popped up tons of confidential data).

    My CU’s website definitely looks like it’s from the early naughts, but they at least kept things up to date and security practices seemed legit, and I don’t think I ever tripped the fraud detector. I guess everyone’s mileage will vary a bit.


  • I think the question “do the ends justify the means” is meant to invoke exactly what you’re describing. What you call the “desired end state” is what the question means by “the end.” The question is framing exactly what you’re saying: the path of reaching a desired outcome includes everything it takes to get there–is it still a desirable end? Is the entire path justified, given the intermediate consequences?

    I’m guessing it’s worded this way because we apply this question/principle to situations where the “end” is altruistic but the “means” are not, and it’s specifically asked because people want to separate the two to ignore the moral/ethical implications of the means. The entire point of the question/principle is that the end cannot be separated from the means with regard to whether it is ethical.