# a' (a prima)

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#### Marco PCA

##### Senior Member
Hola,

¿Cómo se dice en inglés "A prima" cuando uno se refiere en matemáticas a la A que tiene el apóstrofo (A')?

Gracias,
Marco

• #### Chasint

##### Senior Member
A′ ---> A prime ---> /eɪ/ /praɪm/

('A' se dice 'éhi' )
('prime' se dice 'praim')

The prime symbol ( ′ ), double prime symbol ( ″ ), triple prime symbol ( ‴ ), quadruple prime symbol ( ⁗ ) etc., are used to designate units and for other purposes in mathematics, the sciences, linguistics and music.
Prime (symbol) - Wikipedia

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#### jsvillar

##### Senior Member
Double and triple prime? Funny, we say 'prima, segunda, tercera...'
"f de x es seno de x, f prima de x es coseno de x, f segunda de x es menos seno de x..."

#### Chasint

##### Senior Member
Double and triple prime? Funny, we say 'prima, segunda, tercera...'
"f de x es seno de x, f prima de x es coseno de x, f segunda de x es menos seno de x..."
We can also say 'first derivative', 'second derivative', etc.

#### jsvillar

##### Senior Member
We can also say 'first derivative', 'second derivative', etc.
Yes, but since prima, segunda, ... are widely used for the derivatives in written equations, when you are reading aloud you see f', f'' and f''' and say it like that: f prima, f segunda, f tercera.
If I were teaching kids how to do derivatives then I would write f'' and say 'la derivada segunda de f', using better language.

#### Chasint

##### Senior Member
Yes, but since prima, segunda, ... are widely used for the derivatives in written equations, when you are reading aloud you see f', f'' and f''' and say it like that: f prima, f segunda, f tercera.
...
Okay. Then it is different in English! We say, 'prime', 'double prime', etc.

#### Marco PCA

##### Senior Member
Thank you so much for your help @Chasint