"""
TESTS::

    sage: R = Zp(5, prec=5, type='fixed-mod')
    sage: a = random_matrix(R,5)
    sage: a.determinant()
    1 + 3*5 + 3*5^2 + 2*5^4 + O(5^5)
    sage: K = Qp(3, 10,'capped-rel'); K.krull_dimension()
    0

    Computation of logs::

    sage: Qp(5)(1).log()
    O(5^20)
    sage: Qp(5)(-1).log()
    O(5^20)
    sage: Qp(5,prec=5)(7).log()
    4*5^2 + 4*5^3 + 3*5^4 + O(5^5)
    sage: Qp(5,prec=10)(25*8).log(p_branch = 0)
    5 + 3*5^3 + 3*5^4 + 2*5^5 + 5^6 + 2*5^7 + 3*5^8 + 3*5^9 + O(5^10)
    sage: Zp(5,prec=10)(8).log()
    5 + 3*5^3 + 3*5^4 + 2*5^5 + 5^6 + 2*5^7 + 3*5^8 + 3*5^9 + O(5^10)

    Loading and saving elements of various types::

    sage: a = Zp(5)(-3); loads(dumps(a)) == a
    True

    sage: M = MatrixSpace(pAdicField(3,100),2)
    sage: (M([1,0,0,90]) - (1+O(3^100)) * M(1)).left_kernel()
    Vector space of degree 2 and dimension 1 over 3-adic Field with capped relative precision 100
    Basis matrix:
    [1 + O(3^100)            0]
"""
