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Hermit, good point. 
How about doing binary (base2) arithmetic in Spanish, using just the digits 0 and 1?
Also in logic we can use the symbols 0 and 1 to represent two mutually opposite states such as on and off, or true and false? In this system the symbols . and + are used to mean AND and OR 
integral de superficie = surface integral
integral de línea = line integral integral múltiple = multiple integral integración = integration coordenadas polares = polar coordinates coordenadas esféricas = spherical coordinates coordenadas cilíndricas = cylindrical coordinates diferenciable = differentiable diferenciabilidad = differentiability diferenciación = differentiation continuidad = continuity continuo = continuous función derivable = differentiable function (in 1 dimension) función diferenciable = differentiable function (in multiple dimensions) función continua = continuous function derivada parcial = partial derivative conjunto = set subconjunto = subset intervalo = interval dimensión = dimension dominio = domain rango = range polinomio = polynomial 
Why didn't this thread show when I looked under Forums/Vocabulary/Vocabulary by topic? I had to do a search on forum titles.... ???
Anyway  it occurred to me this morning (while teaching about fractions to a group of Spanish speaking students) that I don't know how fractions are worded in Spanish. onehalf twohalves onethird twothirds onefourth twofourths threefourths onefifth twofifths threefifths onesixth oneseventh oneeighth oneninth onetenth etc.... Thanks! 
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Thanks, Hernan! Now, when you say "etc.", I'm not sure how to generically determine the "nth" denominator. In English, we add "th" if it's a unique number name (seventeenth, twentieth, etc.), and if it ends with "one" through "nine", the ending is the same as that number (twentythird, fiftyninth, etc.) How would I determine, say, how to say "eight elevenths" or "fifteen twentythirds", etc.?

onceavos = elevenths
doceavos = twelfths treceavos = thirteenths... veinteavos = twentieths dos quinceavos = two fifteenths trece dieciochavos = thirteen eighteenths I think that's how it goes, in answer to your question Lou Ann. :) 
VERY helpful! Thanks!! :)

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However, I wanted to go to the "undécimo" form, and I could not remember what is it that they are called... Ok, Lou Ann, you are a Math teacher... Numbers: Cardinals, ordinals is there any other? 
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I think that most people would just say that there are cardinal and ordinal numbers. I've read somewhere about "nominal" numbers (numbers that name something like a number on a sports jersey or something like that), but I don't know how conventional that is. In a mathematics class, we talk about real numbers, rational and irrational numbers, integers, whole numbers and natural or counting numbers. Those are probably not practical or "everyday" numbers that anyone but a math teacher would use..... :p 
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