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Sign[x] gives -1, 0, or 1 depending on whether x is negative, zero, or positive. ... Wolfram Language. Revolutionary knowledge-based programming language. Wolfram Notebooks

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Log[z] gives the natural logarithm of z (logarithm to base e). Log[b, z] gives the logarithm to base b.

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x _Symbol can be used as a pattern to represent any symbol. The string " name " in Symbol [ " name "] must be an appropriate name for a symbol. It can contain any letters, letter ‐ like forms, or digits, but cannot start with a digit. Symbol [ " name "] creates a new symbol if none exists with the specified name. A symbol such as x has a name ...

Details. Mathematical function, suitable for both symbolic and numerical manipulation. For nonzero complex numbers z, Sign [ z] is defined as z / Abs [ z]. Sign tries various transformations in trying to determine the sign of symbolic expressions.

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Mathematical function, suitable for both symbolic and numerical manipulation. · For nonzero complex numbers z, Sign[z] is defined as z/Abs[z]. · Sign tries ...

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Details. Log is a mathematical function, suitable for both symbolic and numerical manipulation. Log gives exact rational number results when possible. For certain special arguments, Log automatically evaluates to exact values. Log can be evaluated to arbitrary numerical precision.

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