Template talk:Functions

Vector functions

Why isn't there a link like ■—›Rⁿ for vector functions? Freeboson {talk | contribs} 19:06, 16 July 2013 (UTC)

Maybe, because a vector space is not necessarily a real vector space? Of those Rⁿ represents only a partial (finite-dimensional) case, indeed. I do not know where to push the link vector-valued function and I am not certain the scope of the article. Incnis Mrsi (talk) 20:06, 16 July 2013 (UTC)

I think you might have misunderstood what I meant. In the template, on the left, we have, e.g. ■—›R—›■, where the first mapping is a real-valued function and the second mapping is a function of a real variable. On the right however, we only have Rⁿ—›■, i.e., functions of several variables. I was just wondering why we didn't have instead ■—›Rⁿ—›■: vector-valued functions, and then functions of several variables. The real case is just an example. Freeboson {talk | contribs} 19:32, 17 July 2013 (UTC)

To your other point, I would suggest that all of the links for both ■—›Rⁿ, and ■—›Cⁿ go to the same page vector-valued function. Freeboson {talk | contribs} 21:09, 17 July 2013 (UTC)

Missing characters

Lots of little boxes (presumably missing characters) in the display of this template for me (FF 17.0.9 on Gentoo Linux):

■	—›	B			Bn	—›	B
■	—›	Z	—›	■
■	—›	R	—›	■	Rn	—›	■
■	—›	C	—›	■	Cn	—›	■

(I have replaced the boxes in the original template with the U+25A0 BLACK SQUARE character for the table above.)

Are others seeing these boxes in the original template? I ask because when I copy-and-paste the characters from the template's wiki source into Wiktionary searches, they all led to the entry for that same Unicode character! This is unlike other cases where I'm simply missing the character on my computer (in which case, a Wiktionary search will reveal what characters are actually being used).

If other people are seeing different (meaningful) characters in the original template, what font do they rely on, and are there alternatives we can use that are more widely supported? - dcljr (talk) 03:30, 25 August 2014 (UTC)

Wait a minute... Is this intentional? Are the boxes supposed to represent an "arbitrary set"? If so, we really should probably just use "X" and not a special Unicode character. - dcljr (talk) 03:32, 25 August 2014 (UTC)

Formatting

Hi, there's an unmatched "td>" in the template. OneWeirdDude (talk) 19:39, 24 October 2017 (UTC)

Hi, I find the arrow "—›" a bit unusual. What's wrong with using a basic arrow like "→" or some other, one-character, fancy unicode?

Ordered Pair

The arrow in "B —› X" links to the Page Ordered pair. I don't understand why. If it's not just me, can we explain this linking somehow (at Ordered pair or in a tooltip) or use a more appropriate page? — Preceding unsigned comment added by 2003:e3:5bd5:8091:3a59:f9ff:fe0c:cfcd (talk • contribs)

B is the Boolean (co)domain, which is basically the set {0,1}. A function whose domain is {0,1} has one value assigned to 0 and another assigned to 1; so it's equivalent to an ordered pair. Wyverald (talk) 14:49, 13 September 2021 (UTC)

Function from integers is not a sequence?

I don't understand why function from integer $\mathbb {N} \to X$ links to sequences. As the article about sequences states, a sequence is a function from a natural numbers. Only positive integers are natural numbers. --Alfredbutterbrot (talk) 00:26, 23 April 2022 (UTC)

Actually, the article on sequences states that a sequence is a function from a subset of the integers to X. Still, that is not the same as a function from integers to X...? Alfredbutterbrot (talk) 00:36, 23 April 2022 (UTC)