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  • Jameson's Avatar
    Today, 19:02
    Interesting article! I work with large amounts of data every day and would consider myself an expert in the field when considering the whole...
    1 replies | 21 view(s)
  • MarkFL's Avatar
    Today, 15:28
    MarkFL replied to a thread Trigonometric Identity in Trigonometry
    An alternate approach would be to factor the LHS as the sum of two cubes: ...
    6 replies | 66 view(s)
  • MarkFL's Avatar
    Yesterday, 16:10
    MarkFL replied to a thread [SOLVED] 206.07.05.88 partial fractions??? in Calculus
    No, but either way will work, because of the commutative property of addition.. :D
    6 replies | 74 view(s)
  • MarkFL's Avatar
    Yesterday, 15:45
    MarkFL replied to a thread [SOLVED] 206.07.05.88 partial fractions??? in Calculus
    In the formula you've used, we have $a=1$...and so after back-substituting for $u$: I=\arctan\left(\sqrt{x^2+4x+3}\right)+C
    6 replies | 74 view(s)
  • MarkFL's Avatar
    Yesterday, 14:51
    As long as the radical is not a factor in a denominator (in that case the radicand cannot be zero), then yes that rule can be applied for domain...
    17 replies | 217 view(s)
  • MarkFL's Avatar
    Yesterday, 14:15
    Even though Pre-Calculus is taught in universities, it's really considered a remedial course at that level, and so that's why we classify it as a...
    17 replies | 217 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 15:42
    Let's look at the graph as advised: y=x^4-4x^3+6x^2-4x+2 Based on this, what values of $x$ appear to satisfy the two given inequalities? By...
    2 replies | 41 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 15:39
    Yes, observe that the root $x=0$ is of even multiplicity (4), and so the sign of the expression will not change across this root. The others are of...
    3 replies | 45 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 15:35
    Yes, you should wind up with: \frac{(x+1)(x-6)}{x-1}\ge0 And then observing we have a weak inequality, and that $x=1$ must be excluded...
    3 replies | 43 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 13:40
    MarkFL replied to a thread Words By Kurt Kaiser in Chat Room
    I really just wanted to point out the fallacious nature of incredulity as an argument for anything. :D
    10 replies | 136 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 12:54
    It has no rational roots, but we can use the quadratic formula to state: x^3=\frac{3\pm\sqrt{5}}{2}\implies x=\sqrt{\frac{3\pm\sqrt{5}}{2}} ...
    9 replies | 98 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 12:48
    MarkFL replied to a thread Words By Kurt Kaiser in Chat Room
    It was the study of the Bible (among other things), which I have read through several times, that actually helped drive my skepticism during my...
    10 replies | 136 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 11:20
    MarkFL replied to a thread Words By Kurt Kaiser in Chat Room
    The "argument" given in the OP, and which I was addressing, was exactly that simple from what I saw: "all of this beauty both near and afar,...
    10 replies | 136 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 10:27
    MarkFL replied to a thread Words By Kurt Kaiser in Chat Room
    The main point I was addressing is that which I've heard more than once in my life, which goes something like: I look at the world, with it's...
    10 replies | 136 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 01:50
    MarkFL replied to a thread Words By Kurt Kaiser in Chat Room
    For what it's worth, this is what's know as an Argument from incredulity. It's a fairly common logical fallacy made by those who try to argue...
    10 replies | 136 view(s)
  • MarkFL's Avatar
    June 26th, 2017, 00:31
    One of the proven assertions of the FTOA is: A polynomial of degree n will have exactly n roots (counting multiplicity). That's why I...
    9 replies | 98 view(s)
  • MarkFL's Avatar
    June 25th, 2017, 22:14
    MarkFL replied to a thread Words By Kirk Talley in Chat Room
    That puts me in mind of "Enter Sandman" by Metallica: Hush little baby, don't say a word And never mind that noise you heard It's just the...
    1 replies | 37 view(s)
  • MarkFL's Avatar
    June 25th, 2017, 21:53
    The solution is: \,\cup\, You missed an interval because -2 is not in the interval ... (an alarm should have gone off in your head when you saw...
    8 replies | 87 view(s)
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28 Visitor Messages

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    Hello and welcome back to MHB, Fernando Revilla!

    We are happy to see that you have returned, and we look forward to your continued participation here!

    On Behalf Of MHB's Staff,

    Jameson.
  2. Reply/View Conversation
    Hello and welcome back to MHB, Fernando Revilla!

    We are happy to see that you have returned, and we look forward to your continued participation here!

    On Behalf Of MHB's Staff,

    Jameson.
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    Welcome back, Fernando! Glad to see you've rejoined the party!
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    Woow , it's been a while. Welcome back
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    Welcome back, Fernando!
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    Hey! There you are! I was wondering if you'd be back. We missed you!
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    Hey Fernando, nice to see you back!
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    Congratulations on the 500 post mark! It's great that you've been so active this year Looking forward to the next 500 posts.
  9. Reply/View Conversation
    hola profesor fernando que pena escribir en espaņol pero no se ingles, queria saber si usted conoce alguna aplicacion de las integrales sin(x*x*x*x), he desarrollado un metodo numerico para calcularlas en cualquier valor comprendido en el intervalo de (4,infinito) y mi abogado me dice que tengo que encontrar una aplicacion para poder proteger y blindar de una forma mas segura los derechos de autor, estare pendiente de su respuesta, o si conoce a alguien que me pueda ayudar le agradeceria enormemente, gracias.

    hello fernando teacher wanted to know if you know any application of the integral sin (x * x * x * x), I have developed a numerical method to calculate any value in the interval (4, infinity) and my lawyer tells me I have to find an application in order to protect and shield in a more secure copyright, I will be aware of your answer, or if you know someone who can help me I would appreciate greatly, thanks.

    att
    jefferson alexander vitola
  10. Reply/View Conversation
    LOL! Nicely put!
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About Fernando Revilla

Basic Information

About Fernando Revilla
Biography:
Head of Mathematics Department, I.E.S. Sta Teresa, Madrid.
Prof. of Mathematical Methods, Univ. Alfonso X El Sabio, Madrid.
(Up until the 2008/2009 academic year. I am now devoted to investigation).
Location:
Madrid, Spain
Interests:
Epistemology of IN
Occupation:
Mathematician
Country Flag:
Spain

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