TypeError: unsupported operand parent(s) for *: 'Integer Ring' and ''

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后悔当初
后悔当初 2021-02-11 11:14

I am using Sage to plot a slope field for x\'=-x+80-40*sign(t-6). My coding looks like:

var(\'t,x\')
def sign(t):
    if t > 0:
        return 1
    if t == 0:         


        
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