This is a list of factual errors I've found on the
MathWorld site. This is for tracking purposes to ensure these errors are fixed.
Strophoid
Formula (2), the expression for the y-coordinate, the radical term should be multiplied by m.
Formula (4), given as the polar equation of a general strophoid, is in fact the formula for an oblique strophoid.
Rule 220 and Rule 222
Formulas are interchanged.
Semicubical Parabola
Formula (8) for arclength is incorrect, should be 1/12 instead of 1/27. (this is assuming a=1 which is the only value that makes the numerator correct.)
Inverse Curve
In the definition in the first line, the relationship between OP and OQ is correct, but nowhere does it say that O, P and Q must be colinear, which is required.
This is a list of factual errors I've found on the
MathWorld site. This is for tracking purposes to ensure these errors are fixed.
Strophoid
Formula (2), the expression for the y-coordinate, the radical term should be multiplied by m.
Formula (4), given as the polar equation of a general strophoid, is in fact the formula for an oblique strophoid.
Rule 220 and Rule 222
Formulas are interchanged.
Semicubical Parabola
Formula (8) for arclength is incorrect, should be 1/12 instead of 1/27. (this is assuming a=1 which is the only value that makes the numerator correct.)
Inverse Curve
In the definition in the first line, the relationship between OP and OQ is correct, but nowhere does it say that O, P and Q must be colinear, which is required.