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have no fear, amistre the logician is here !
:)

(s -> -t) = (-s -> r) prove this?

Prove that R is a true statement

lol ... first i have to understand the question

what does it mean that everything is a premise ?

I was asking amistre - what it actually means :)

dunno, i think thats the next chapter in class :)

premise i think means, assume its true

Premise means it is given. It is presumed to be true.

S -> -T
1 -> 0 = 0
1 -> 1 = 1
0 -> 0 = 1
0 -> 1 = 1
T = 1
0 -> 0 = 1
-S -> R
1 -> 0 = 0
1 -> 1 = 1

Thanks. I'll go with this.

i got know idea how to write it out better :)