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The quantity is not a quantified system of equations and inequalities

Posted 6 years ago
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(*Axialsimmetric Problems) I write the physics laws,There is shaft mounted with rim for interference with a flywheel. The three costant C1,C3,C4 I find them by imposing the boundary conditions: I don't know because Mathematica give me this error,that i've published in the picture. I try the solution exact of the three costant C1,C3,C4....... Thank you and good day!!!

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Consider this example:

 Solve[0.1 (x == 5), x]

This gives the same error message. This is because 0.1 (x == 5) isn't syntatically correct. You can't multiply an equation by a number.

Thank You. I wanted to ask one more thing, how do I write functions functions as u [r] is a function of sigmatheta and sigma r which are themselves functions of r, but when I assign the value(a or b) of the boundary r, moving u does not process the exact calculation, why?Also now creating new variables to the previous question I send calolo and shows me the braces without any written, why? Is there any command in particular that you have to use?I place the photo .Sorry for my English simple.Thanks.

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