 | 1 | initial version | |
I am new to sage and wondering why it doesn't reverse the terms (or the sign) of an inequality when multiplying by -1. E.g.:
sage: var('x y')
(x, y)
sage: f = x + 3 < y - 2
sage: f*2
2*x + 6 < 2*y - 4 # preserves truth-value of f
sage: f*(-1)
-x - 3 < -y + 2 # reverses truth-value of f
Why?
| | 2 | retagged |
I am new to sage and wondering why it doesn't reverse the terms (or the sign) of an inequality when multiplying by -1. E.g.:
sage: var('x y')
(x, y)
sage: f = x + 3 < y - 2
sage: f*2
2*x + 6 < 2*y - 4 # preserves truth-value of f
sage: f*(-1)
-x - 3 < -y + 2 # reverses truth-value of f
Why?
| | 3 | retagged |
I am new to sage and wondering why it doesn't reverse the terms (or the sign) of an inequality when multiplying by -1. E.g.:
sage: var('x y')
(x, y)
sage: f = x + 3 < y - 2
sage: f*2
2*x + 6 < 2*y - 4 # preserves truth-value of f
sage: f*(-1)
-x - 3 < -y + 2 # reverses truth-value of f
Why?
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