diff
integrate
ldefint
gcd
lcm
divide
linsolve
lbfgs
partfrac
laplace
ilt
find_root
taylor
sum
product
limit
ratsimp
radcan
gfactor
factor
expand
logcontract
trigsimp
allroots
exp
log
abs
sqrt
sin
cos
tan
sec
cot
del
clear
invert
determinant
eigenvalues
eigenvectors
adjoint
transpose
genmatrix(lambda([i,j]
matrix
r_d
d_r