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Question: why Maple sometimes uses _C1, _C2, etc.. for constants and sometimes c[1],c[2], in the same result?

Question:why Maple sometimes uses _C1, _C2, etc.. for constants and sometimes c[1],c[2], in the same result?

nm 8552 Maple 2018
constants pdsolve differential-equations
December 28 2018
0

I thought in Maple the standard was to use _C1, and _C2, etc... for constants in the solutions returned.

Sometimes Maple mixes _C1 and c[2] in the same result. Is this common, to be expected sometimes and is OK? I noticed this only recently. 

I was thinking may be some part of Maple code still was not updated to use _C1 notation? Here is an example

restart;
pde:=diff(u(x,t),t)+ diff( u(x,t),x )^3 + 6 * u(x,t)* diff(u(x,t),x) = 0;
sol:=pdsolve(pde,u(x,t));

which gives

sol := u(x, t) = -(3/2)*_C1^2+3*(t*_c[2]+x)*_C1-(3/2)*(t*_c[2]+x)^2-(1/6)*_c[2]

With latest Physics updates  268
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