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The text Introduction to Proof in Abstract Mathematics (copyright 1990 Saunders College Publishing) has been reissued by Dover Publications (copyright 2011, Andrew Wohlgemuth). Read the introduction to the Dover edition here.
The following two texts may be downloaded free. They are copyrighted, but may be freely copied for personal or class use.
Download as a 982K pdf file.
Download as a 246K pdf file.
Read the introduction here.
Here's a note on high-school geometry and seemingly valid proofs of obviously invalid propositions.
The introductory sections of the two texts above contain some observations on mathematics and philosophy. More of this in The "Unreasonable" Effectiveness of Mathematics.
An essay review of The Resurrection of God Incarnate by Richard Swinburne, Oxford University Press, 2003. The review was first published in the online journal of the philosophy of religion Ars Disputandi, www.arsdisputandi.org (2004), and republished by The New Oxonian, June 1, 2012.
First read this.
A critically important note.
Here's an account of my involvement in biomedical research.
Here's an account of the work of those whose research could save your life:
A FEW LESS PROFOUND BUT PERHAPS HELPFUL NOTES