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Latest activity

  • Dr.Peterson
    Dr.Peterson replied to the thread Subtract quantities.
    Don't think of the lines as part of the regions, but as fences separating them. You may even want to imagine that a disk has been cut...
  • Dr.Peterson
    What events are you calling R, C, and D? Also, in your notation, what does a comma mean?
  • Dr.Peterson
    Dr.Peterson replied to the thread graphing 3D question.
    The equation 2 = x - y represents a plane; its intersection with the plane z = x - y is a line in the plane z = 2.
  • MarkFL
    MarkFL reacted to mmm4444bot's post in the thread Features in XenForo with Like.
    I've started this thread to post about useful features/tips in the new forum software (XenForo). This thread is not for posting...
  • T
    tkhunny replied to the thread Subtract quantities.
    Get a standard mass scale with pans on both ends. "Subtraction" happens by adding mass to the other side.
  • R
    Ryan$ replied to the thread Subtract quantities.
    to be more clear I imagine a subtraction of things/objects like this diagram .. but what's confusing me for instance if I do subtraction...
    • VDAIntersectsB.png
  • R
    Hi guys, I'm so sorry to post like this thread but to understand me please I really am not trolling/joking ..whatever. if I have an...
  • mmm4444bot
    mmm4444bot posted the thread Features in XenForo in News.
    I've started this thread to post about useful features/tips in the new forum software (XenForo). This thread is not for posting...
  • V
    Vol replied to the thread graphing 3D question.
    Oh, OK. That is what I thought. But I could not find an explanation. The 3D graphers online showed weird things. Like a vertical...
  • J
    Jomo replied to the thread Need help with finding exact values.
    Khan told you that π/4 + π/3 = 7π/12, you know the formula for tan(a+b) and you know the value of know tan(π/4) and tan (π/3)? So use...
  • H
    Oopsie!! That's what happens when you don't read the question carefully! (And yes Jomo, it would be only five if it was allowed.)
  • pka
    pka replied to the thread Basic proof question.
    Do you know that \emptyset\times Y=\emptyset~? If that is the case then the the conclusion fails. Not knowing you instructor's style, I...
  • T
    tkhunny replied to the thread Basic proof question.
    Where's your use of X not the null set? Is there room for an Injection or Surjection in your argument?
  • Dr.Peterson
    It's clear that we need at least 7 swaps, since if you add up the distance each letter has to move, we get 14, and each swap moves two...
  • MarkFL
    MarkFL replied to the thread Sign measurements.
    Knowing the maximal area of the signs won't tell you what the dimensions of the signs must be, unless we know either how the width and...
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