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Description
Ah, math jokes. ._.;

In calculus, when you test a given function for concavity via a second derivative test, you'll place your values on a numberline and test values higher and lower than those numbers in order to see if the function is concave up or concave down.

If your result is positive, you will write a + sign above the numberline

and the concave up symbol= +u+
which looks like Eesti's face,

and if your result is negative, you write a - sign above the numberline,

and the concave down symbol= -n-
which looks like Peter's face.

Yeah just a quick doodle...I like, seriously running out of ideas. =3=

Description
Ah, math jokes. ._.;

In calculus, when you test a given function for concavity via a second derivative test, you'll place your values on a numberline and test values higher and lower than those numbers in order to see if the function is concave up or concave down.

If your result is positive, you will write a + sign above the numberline

and the concave up symbol= +u+
which looks like Eesti's face,

and if your result is negative, you write a - sign above the numberline,

and the concave down symbol= -n-
which looks like Peter's face.

Yeah just a quick doodle...I like, seriously running out of ideas. =3=