Amit Kumar aktech

Minutes of the Meeting

1st July 2015

Priorities are mentioned with --> [ ]

FiniteSet PR sympy/sympy#9540 (Fix test_partition.py Error) [1]
Fix invert_real (Abs(x) - n) [2] (1 week)
not_empty_in ({n} .intersection(-oo, 0)) [2] (1 week)

Brief: return invert with the information of the set in which the invert is valid:

We are planning to deprecate the current behavior of FiniteSet , with a flag which is default set to True for the new behavior. to get the old behavior one has to set it to False. See this to know the difference between behaviors.

This can be solved using properties of LambertW Function.

x + exp(x**2) = 0
1 = -x*exp(-x**2)
squarring both sides
1 = (x**2)*(exp(-2*x**2))
Multiply by -2 on both sides
-2 = (-2*x**2)*(exp(-2*x**2))
Taking LambertW on both sides:
LambertW(-2) = LambertW((-2*x**2)*(exp(-2*x**2)))

Note: This file is a machine translation of solver1.pdf.

Acknowlegments: Many persons and institutions contributed considerably to the success of this work. I would like to express my thanks to:

Richard Petti and Jeffrey P. Golden of Macsyma, Inc. (USA) for their interest in this work, for supplying Macsyma licenses and the modifcation of the LINSOLVE function,
The Center for Microelectronics of the University of Kaiserslautern, in particular Dr. Peter Conradi and Uwe Wassenmüller, for the support of the project,
Clemens, Frank and Michael for the first-class WG life and particularly Michael for the


	from sympy import *
	print atan2(0, sqrt(sqrt(-I)*(1 + I)))



	# from sympy import *
	# from sympy.abc import n

	# f = -I(I(2pin - pi/4) + log(sqrt(sqrt(2)sqrt(-I)/2 + sqrt(2)I*sqrt(-I)/2)))

	amit@amit-UDell:~/Desktop/myrepo/sympy/sympy/matrices$ grep -r -H "NotImplementedError"
	Binary file expressions/blockmatrix.pyc matches
	Binary file expressions/determinant.pyc matches
	expressions/tests/test_matrix_exprs.py: raises(NotImplementedError, lambda: 2/B)
	expressions/matmul.py: raise NotImplementedError("Can't simplify any further")
	expressions/matexpr.py: raise NotImplementedError
	expressions/matexpr.py: raise NotImplementedError("Matrix Power not defined")
	expressions/matexpr.py: raise NotImplementedError()
	expressions/matexpr.py: raise NotImplementedError(
	expressions/matpow.py: raise NotImplementedError(("(%d, %d) entry" % (int(i), int(j)))