My Math Forum Difference between Speed and Velocity

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 April 29th, 2018, 05:28 AM #11 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,131 Thanks: 914 As example (I changed the dollar signs to S): S \dfrac 3 2 \dfrac d v - \dfrac d v = \dfrac 5 2 S what I "see" is: "undefined control sequence \ dfrac" ...all in shining yellow colored background!! Refreshing page and/or swearing like a sailor don't help
 April 29th, 2018, 05:41 AM #12 Senior Member   Joined: Jun 2015 From: England Posts: 853 Thanks: 258 $\displaystyle \frac{{dy}}{{dx}} = \frac{{\Delta y}}{{\Delta x}} = \frac{{\delta y}}{{\delta x}} \ne \frac{{{\partial ^2}\Omega }}{{\partial {u^2}}}$ Try swearing properly, like a Marine. What do you see of this?
April 29th, 2018, 05:46 AM   #13
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Before refreshing it looks like this, indefinitely.

After refreshing, then waiting 48 seconds, the forum software deigns to "load Mathjax" and it looks like the second pic.
Attached Images
 mf1.jpg (95.1 KB, 6 views) mf2.jpg (16.7 KB, 3 views)

Last edited by skipjack; April 29th, 2018 at 03:15 PM.

April 29th, 2018, 07:56 AM   #14
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Quote:
 Originally Posted by studiot $\displaystyle \frac{{dy}}{{dx}} = \frac{{\Delta y}}{{\Delta x}} = \frac{{\delta y}}{{\delta x}} \ne \frac{{{\partial ^2}\Omega }}{{\partial {u^2}}}$ Try swearing properly, like a Marine. What do you see of this?
I see that clearly...no problems...

 April 29th, 2018, 11:25 AM #15 Senior Member   Joined: Jun 2015 From: England Posts: 853 Thanks: 258 Perhaps you are not entering the correct code for this forum's implementation? This is the actual code I entered. I have removed the initial and final square bracket to prevent it rendering. math]\frac{{dy}}{{dx}} = \frac{{\Delta y}}{{\Delta x}} = \frac{{\delta y}}{{\delta x}} \ne \frac{{{\partial ^2}\Omega }}{{\partial {u^2}}}[/math Note how the forum software has changed the mathml indicators to something else in the screenshot.
 April 29th, 2018, 11:42 AM #16 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,131 Thanks: 914 Yer missing my point: I don't use latex: this happens when I look at posts where latex has been used... I first see 'em in latex format (with the \$); a few seconds later, after the "formatting", instead of seeing the equation in all its f'n glory, I see that "yellow" phenomenon I described....got it?? Btw, if I replace your $with \, it still works the same... Last edited by skipjack; April 29th, 2018 at 03:13 PM.  April 29th, 2018, 11:44 AM #17 Senior Member Joined: Sep 2016 From: USA Posts: 444 Thanks: 254 Math Focus: Dynamical systems, analytic function theory, numerics My 2 cents: 1. The biggest critique is to get rid of the "typing" of each character. This was absolutely dreadful and despite the video being less than 2 minutes, I almost closed it anyway. You should just display the full text, or if you like, uncover it accompanied by a voiceover. 2. If the ideal audience for this video is lower level math, then you might want to include a scalar example where speed and velocity differ. For example, a person's speed when driving to and from a place is positive, whereas for velocity one of these should be negative. April 29th, 2018, 12:21 PM #18 Senior Member Joined: Oct 2009 Posts: 498 Thanks: 164 Quote:  Originally Posted by SDK 1. The biggest critique is to get rid of the "typing" of each character. This was absolutely dreadful and despite the video being less than 2 minutes, I almost closed it anyway. You should just display the full text, or if you like, uncover it accompanied by a voiceover. Oh man, so true. It makes this unbearable to watch. April 29th, 2018, 12:45 PM #19 Math Team Joined: May 2013 From: The Astral plane Posts: 1,888 Thanks: 765 Math Focus: Wibbly wobbly timey-wimey stuff. Quote:  Originally Posted by studiot math]\frac{{dy}}{{dx}} = \frac{{\Delta y}}{{\Delta x}} = \frac{{\delta y}}{{\delta x}} \ne \frac{{{\partial ^2}\Omega }}{{\partial {u^2}}}[/math Note how the forum software has changed the mathml indicators to something else in the screenshot. First, you can wrap the entire code inside "noparse" tags: [math]3 \times 6$$\displaystyle 3 \times 6$Second, why are you using {{ }} ? $\frac{dy}{dx}$ gives$\displaystyle \frac{dy}{dx}\$.

-Dan

April 29th, 2018, 01:14 PM   #20
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Quote:
 2. If the ideal audience for this video is lower level math, then you might want to include a scalar example where speed and velocity differ. For example, a person's speed when driving to and from a place is positive, whereas for velocity one of these should be negative.
Good point, but how about a runner on a circular running track, keeping a constant speed but having a constantly changing velocity as she runs around the track?

Last edited by skipjack; April 30th, 2018 at 06:39 AM.

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