Pretty print output in Jupyter notebook

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Many thanks for your answer. I was aware of %display latex . It seems that typeset is a synonym of latex. Unfortunately, since MathJax only typesets maths, it does not help if the output also contains text. Anyway, while digging in HTML for a different question,I have found a simple workaround: to use the HTML code of the conflicting characters. This works:

limit = r"\displaystyle\lim_{x\to0}\frac{\sin x}{x}="
value = lim(sin(x)/x, x=0)
show(html("Solución: "+"${}={}$".format(limit,value)))

A function generating the HTML representation of an UTF-8 string probably exists in the zillions of available Python libraries. You could try to pip install one of them and import it in Sage, no ?

No need necessarily for a non-standard library. On Python 2 you can do:

>>> u'Solución'.encode('ascii', 'xmlcharrefreplace')
'Solución'

Of course in this case you just get a hex escape instead of the more readable entity name, which is not ideal. I think there are ways to get entity name conversions as well. Regardless this shouldn't usually even be necessary, but as you wrote unicode will be handled better in Python 3 across the board.

Many thanks for your suggestion. Yes, I could do so in my own computer. But the notebook should run in university or students' computers, which I cannot configure. However, I could include such a function in the notebook. As a proof of concept, I could define

def html_fy(string):
    html_code={"á":"á", "é":"é", "í":"í", 
               "ó":"ó", "ú": "ú"}
    for letter in html_code.keys():
        if letter in string:
            string=string.replace(letter,html_code[letter])
    return string

And then write

text = html_fy("Solución válida: ")
limit = r"\displaystyle\lim_{x\to0}\frac{\sin x}{x}"
value = lim(sin(x)/x, x=0)
show(html(text+"${}={}$".format(limit,value)))

which provides exactly the kind of output I was seeking for.