Update 'README.md'

README.md

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 This script calculates signature functions for knots (cable sums).
-
 The script can be run as a sage script from the terminal or used in interactive mode.
-
 A knot (cable sum) is encoded as a list where each element (also a list) corresponds to a cable knot.
-
-To calculate the number of characters for which signature function vanish use the function eval_cable_for_thetas as shown below.
-
-sage: eval_cable_for_thetas([[1, 3], [2], [-1, -2], [-3]])
-
-T(2, 3; 2, 7) # T(2, 5) # -T(2, 3; 2, 5) # -T(2, 7)
-Zero cases: 1
-All cases: 1225
-Zero theta combinations:
-(0, 0, 0, 0)
-
-sage:
-
-
-The numbers given to the function eval_cable_for_thetas are k-values for each
-component/cable in a direct sum.
-
-
-To calculate signature function for a knot and a theta value, use function
-get_function_of_theta_for_sum as follow:
-
-sage: signature_function_generator = get_function_of_theta_for_sum([1, 3], [2], [-1, -2], [-3])
-sage: sf = signature_function_generator(2, 1, 2, 2)
-sage: print sf
-0: 0
-5/42: 1
-1/7: 0
-1/5: -1
-7/30: -1
-2/5: 1
-3/7: 0
-13/30: -1
-19/42: -1
-23/42: 1
-            17/30: 1
-4/7: 0
-3/5: -1
-23/30: 1
-4/5: 1
-6/7: 0
-37/42: -1
-sage:
-
-or like below:
-
-sage: print get_function_of_theta_for_sum([1, 3], [2], [-1, -2], [-3])(2, 1, 2, 2)
-0: 0
-1/7: 0
-1/6: 0
-1/5: -1
-2/5: 1
-3/7: 0
-1/2: 0
-4/7: 0
-3/5: -1
-4/5: 1
-5/6: 0
-6/7: 0
-sage: