Equals Sign with a Dot or a ~ Over It
Date: 01/25/2001 at 16:45:26 From: J. Leon Shohet Subject: Meaning of a special equal sign What does an equals sign with a dot (.) over it mean?
Date: 01/26/2001 at 16:39:35 From: Doctor Ian Subject: Re: Meaning of a special equal sign Hi, That symbol means 'is nearly equal to'. - Doctor Ian, The Math Forum http://mathforum.org/dr.math/
Date: 12/04/2001 at 10:26:47 From: Kyle Lawrence Subject: A symbol I don't know What does an equals sign with a ~ over it mean?
Date: 12/04/2001 at 12:39:19 From: Doctor Ian Subject: Re: A symbol I don't know Hi Kyle, It means 'approximately equals'. For example, the value of pi is approximately 3.14, so we might write ~ pi = 3.14 It's a subtle distinction, but an important one. Ignoring it can lead you to results like this: x^2 = 2 x = sqrt(2) x = 1.41 x * x = 1.41 * 1.41 x^2 = 1.98 2 = 1.98 Note the difference: x^2 = 2 x = sqrt(2) ~ x = 1.41 ~ x * x = 1.41 * 1.41 ~ x^2 = 1.98 ~ 2 = 1.98 Does this help? - Doctor Ian, The Math Forum http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.