User talk:Comech

Mathworld has the D'Alembertian as box squared not box. Please change it back. In my E&M 2 class, we use Griffiths and Griffiths also uses the box squared. Box by itself must then be covariant differential operator. Fader05 (talk) 19:57, 2 March 2009 (UTC)[reply]

I reverted your changes. The change of order in the second was only caused by the change of definition in the first. If you don't want to state the commutativity as it is, it might be best to state those as alternative definitions anyway, and show they are equivalent by proving commutativity, or something like that. And your assertion that s is more common would need a source; editors have generally been happy with tau, which is the one that is more common in my own experience. Dicklyon (talk) 17:43, 21 June 2009 (UTC)[reply]

At Titchmarsh convolution theorem, you wrote:

If ${\displaystyle \phi \,(t)}$ and ${\displaystyle \psi (t)\,}$ are integrable functions, such that

${\displaystyle \int _{0}^{x}\phi (t)\psi (x-t)\,dt=0}$

almost everywhere in the interval ${\displaystyle 0<x<\kappa \,}$, then ${\displaystyle \phi (t)=0\,}$ almost everywhere in ${\displaystyle (0,\lambda )\,}$, and ${\displaystyle \psi (t)=0\,}$ almost everywhere in ${\displaystyle (0,\mu )\,}$, where ${\displaystyle \lambda +\mu \geq \kappa }$.

I don't think the word "where" should be used as a quantifier since it leaves on guessing which quantifier it's supposed to be. If I write

a + b = c

where a = the price of widgets,...

etc., then "where" just means I'm explaining what my notation means. That's perfectly clear. But my suspicion in this case is that you meant there exist λ, μ such that the conclusions hold. I.e. you meant "where" as an existential quantifier. You could have said "for some λ, μ such that λ + μ ≥ κ, if indeed that's what you meant.

Is that in fact what you meant? Michael Hardy (talk) 01:07, 1 February 2010 (UTC)[reply]

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Acather96 (talk) 09:12, 25 October 2010 (UTC)[reply]

standard conventions

Please these recent edits. Note:

• You should not indiscriminately italicize everything in non-TeX mathematical notation. Variables should be italicized; digits and parentheses and other punctuation should not.
• Proper spacing is used before and after "+" and "=" and "<", etc.
• A minus sign is not a stubbly little hyphen. Thus:

Right: 3 − 5

Wrong: 3 - 5

• En-dashes rather than hyphens are used in ranges of pages.
• One sets the title phrase or title word in bold at its first appearance in the article.

These things are codified in

WP:MOSMATH. Michael Hardy (talk) 04:23, 6 July 2013 (UTC)[reply

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Нет слов. Comech (talk)

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