Is it possible to delay/hold the automatic evaluation in expression after
applying subs() ? I am facing the below problem because of such
automatic evaluation
sage: var('l ,u')
(l, u)
sage: f = l-u <= 0
sage: f.subs({l:oo})
+Infinity <= 0 #this is not expected as it becomes False. what
should be given is that oo -u <= 0 (which implies oo <= u) .
Doing this same operation in sympy gives the desirable output
In [76]: f = l-u <= 0
In [77]: f.subs({l:oo})
Out[77]: -u + oo <= 0
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