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  1. sysprog

    B Can dx be negative?

    How about looking at it as a state space?
  2. sysprog

    B Can dx be negative?

    It's not precisely a "below example"; it's above the text that refers to it; but it's nevertheless a good example; and, at least in my view, a little bit of notational abuse can sometimes be rather good. :wink:
  3. sysprog

    B Can dx be negative?

    Well, in apparently rejecting infinite times infinite, you appear to my not-as-good-at-math-as-you person to be rejecting the idea of the cardinality of the power set of the reals being strictly greater than that of the reals, so I think that maybe I'm wrong.
  4. sysprog

    B Can dx be negative?

    no calling hutch simple I think that no-one should be calling you simple-minded -- not even you -- the main thing that I see as simple that I can see about your mind is that you exhibit a simple preference for what you see as the truth.
  5. sysprog

    B Can dx be negative?

    I like what you said, @fresh_42 -- my teacher, who was teaching single-variable calculus to a bunch of kids, wanted to explain to inquiring minds like mine, what to do about the infinitesimal.
  6. sysprog

    B Can dx be negative?

    Non-zero can be positive in some cases and negative in others -- my teacher told me that the infinitesimal was 'treated as' zero.
  7. sysprog

    Problems with English

    Oh, so he presumably was 'Bayerische', as in 'Bayerische Motoren Werke'?
  8. sysprog

    All the types of food and/or drinks that the body needs?

    It's 'it's'; not 'its' when it's a contraction, and not a possessive; and it's 'you're'; not 'your' when it's a contraction, and not a possessive; and yes, I have learned some Latin, I'm not especially good at Greek, but I have learned some Greek, too; I'm pretty good at speaking and writing...
  9. sysprog

    Medical Biology/medical question about estrogen foods/drinks

    No. It's not true. Everything that the chickens eat is expressed in the ova, even if whatever it is, as is probable, is expressed in a very minuscule manner.
  10. sysprog

    All the types of food and/or drinks that the body needs?

    Please take note of the difference between 'affect' and 'effect', @Laroxe, especially when the word is a verb.
  11. sysprog

    All the types of food and/or drinks that the body needs?

    Yes, we need water. always.
  12. sysprog

    Weirdest/things that blew your mind when you learned them

    Your post #90 in this thread was in my view an especially nice post @Klystron.
  13. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    Using 'tis as an abbreviation for 'it is' is different from (incorrectly) using 'it's' for something possessed by an 'it'. Yes, a lot of of Shakespeare is written in iambic pentameter.
  14. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    I used \dots instead of typing period marks in -- oh, and, 'its', in the possessive sense, doesn't take the apostrophe -- that's for a contraction of 'it is'; not for a possession of something that belongs to something that we call 'it'.
  15. sysprog

    Weirdest/things that blew your mind when you learned them

    Those methods are even more inefficient than the sieve of Eratosthenes.
  16. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    I 'corrected' your ##\LaTeX## ##-## you had 4 dots instead of 3 ##-## :wink: your math was just fine ##\dots##
  17. sysprog

    My favored scientist quotes

  18. sysprog

    Physics Mental calculation and its importance in physics

    I like doing mathematics in my head: {me + 'nice pretty of-sufficient-age girl person' = fun}. :cool:
  19. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    In my view, the sigma notation, in this instance, refers to sum, I think that I don't quite fully understand your question . . .
  20. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    Well, equally true is that it must be non-zero for any non-zero force -- if it is infinitesimal it is still infinitesimally non-zero. Let's please not abuse zero while we are petting our pet inconsistencies . . .
  21. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    It means that any force acting on the body in any direction is counter-balanced by a force acting in an oppositional direction.
  22. sysprog

    2.3 Exercises from the Feyman Lectures on Physics

    Please try to understand what Professor Feynman meant by the words 'static equilibrium'.
  23. sysprog

    All the types of food and/or drinks that the body needs?

    Lipoprotein analysis is very complicated -- it makes me 'carsick' (as if I'm experiencing travel sickness because my brain is working too hard) when I read it -- I suggest that you should do whatever Mom says, and what specifically she means by it, when she tells you to 'please eat right' ---...
  24. sysprog

    CPU Speed Test?

    It's true that almost all SSDs run via SCSI rather than by the older IDE interface; however. most SSDs are NAND-based devices, which are addressable at a block level, as distinguished from byte-addressable, slower, NOR-based devices -- ref: https://en.wikipedia.org/wiki/Flash_memory
  25. sysprog

    Problems with English

    Once when Princess Anne fell from her show-jumping horse, a very polite press person asked her, "would you care to tell us exactly how you fell from your horse? -- to which she immediately replied "No, I wouldn't, thank you very much". The 'no' used a 2-tone falling tone, the 'would' was said...
  26. sysprog

    Problems with English

    It's informally called 'snooty'.
  27. sysprog

    Johns Hopkins Global Security Index

    I think that you might need to do a little breathing from a tank of dephlogisticated air. :wink:
  28. sysprog

    Johns Hopkins Global Security Index

    The panickers have somewhat abated their zeal -- I can now buy bread, and regular-sized boxes of tissues and packs of napkins, although the branded bread and 'bathroom tissue' rolls are still swept off of the shelves at some stores. One store near me limited customers to no more than 2 loaves of...
  29. sysprog

    I Increasing the output torque of a DC motor with gears

    That's true. I was trying to correct a misimpression, and in doing so, I neglected something myself. Thanks for catching that error.
  30. sysprog

    I Increasing the output torque of a DC motor with gears

    The torque doesn't go to infinity, and if the motor RPM speed goes to zero, so does the torque. I suggest that you take 2 same-size coins and place them flat on a table, 1 edge-on to the other -- you'll notice that if you revolve 1 around the other, it will rotate on its central axis exactly...
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