Calc
Inductive()
Lemma
NewType()
Proof
QExists()
QForAll()
Struct()
axiom()
cond()
define()
prove()
search()
simp()
abstract_arith()
rlemma()
sin_lower()
sqrt_bnd()
sqrt_lower()
sqrt_upper()
>>> kd.prove(real.cos(0) == 1, by=[cos_bnd(arb(0))]) |- cos(0) == 1