Welcome to the forum.

When coordinates were invented (By Descartes) it was entirely arbitrary which went across and which up, and also which is the independent variable. It's just a matter of what is usually done.

If you plot a function y = f(x) and also it's inverse y = f-1(x) on the same graph you will notice that each is a reflection of the other in the line y = x. This can be a quite useful property, and you'd loose it if you kept x as a function of y. But I take your point; it does seem odd to change things around after you've re-arranged the formula.

But the notation is just a way of telling people what the function is so the choice of letters is arbitrary too.

y = 2x + 3

x = 2y + 3

t = 2v + 3

are all describing the same function.

If you're asked to re-arrange a formula in an exam, read the question carefully to see what is expected.

Best wishes, stay safe,

Bob

]]>I've never done this before so I had to search for the right commands. I think I've done it ok.

Bob

]]>While it is true that Spanish calendars list their weeks from Lunes to Domingo (Mondays to Sundays), in the United States and AFAIK, MOST places list their weeks from Sunday to Saturday.

I checked out your DayofWeek page and notice you list your weeks like the Spanish do. Can you allow individual users to select their own preference for that?

]]>That looks like:

[center]This post is just to test

whether we have the center tags or not.

Sorry for the inconvenience.[/center]for me. That's what happens when the BBcode parser cannot interpret the code.

Bob

It was what exactly it looks like here. I was just testing whether the tag will succeed or fail. And it fails.

]]>I think the answer to your question is that members cannot do this but administrators can. But, I've just done a search through your posts and I think they are worth keeping.

Bob

]]>They are in the topic 'Exercises' here.

]]>because I'm tired from doing zoom in using Chrome browser

]]>When you start seeing beautiful things in math, your life will forever be more fun!!]]>

Given that bobbym is a mathematical god, maybe that's as it should be. Enlightenment requires some effort.

I want to be the second mathematician to go to nirvana!

]]>This aspect has been noted in 'Suggestions and Comments'.

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